Product-by-Process Patent Must be Directed to New Product

SmithKline Beecham v. Apotex (Fed. Cir. 2006, 04–1522).

SmithKline’s U.S. Patent No. 6,113,944 is directed to paroxetine (Paxil) made through an allegedly novel process (product-by-process). In 1998, Apotex filed its ANDA and paragraph IV certification asserting that the patent was invalid — thus provoking action from SmithKline.

On summary judgment, the district court found the patent invalid as anticipated by prior knowledge of paroxetine. Specifically, the lower court determined that the claimed process steps were not limiting.  Thus, any prior disclosure of the end-product was anticipating.

Product-by-Process: On appeal, the CAFC affirmed, finding that product-by-process claims cannot recapture the end-product from the public domain.

[O]nce a product is fully disclosed in the art, future claims to that same product are precluded, even if that product is claimed as made by a new process.

This rule of law follows the MPEP, which states that:

[Even] though product-by-process claims are limited by and defined by the process, determination of patentability is based on the product itself. The patentability of a product does not depend on its method of production. If the product in the product-by-process claim is the same as or obvious from a product of the prior art, the claim is unpatentable even though the prior product was made by a different process.

MPEP § 2113 (8th ed., Rev. 2, May 2004) (quoting In re Thorpe, 777 F.2d at 698).

Differences from Prior-Art Product: In a footnote, SmithKline’s attorneys noted that the product made through the claimed process is actually different (lacked a pink hue and did not contain spherical granules).  The district court ignored these differences because they were “not required by the patent claims or specification.” 

However, the appellate panel the differences at least interesting — “If those product-by-process claims produced a different product than that disclosed by the [prior art], there would be an argument that the [prior art] disclosure did not anticipate.” In the end, the panel refused to consider the issue because it was only raised in a footnote:

This footnote is the only statement that even approaches a substantive argument on novelty in the entire Argument section of SmithKline’s opening brief. . . . We find that these mere statements of disagreement with the district court as to the existence of factual disputes do not amount to a developed argument. . . . Further, arguments raised in footnotes are not preserved.

Invalidity affirmed.

NTP v. RIM — Pending Injunction

February 24, 2006 is a big day in the ongoing NTP v. RIM BlackBerry dispute. The District Court may issue its decision on an injunction at the scheduled hearing.  NTP’s patents continue to be rejected at the PTO, but the PTO’s decision may be found worthless until it is eventually made final.

News Reports:

Quotes from the articles:

  • “Research In Motion Ltd. will probably be ordered to halt most of its U.S. BlackBerry e-mail service after a judge hears arguments today on a proposed shutdown.” Bloomberg News
  • “In my 30 years of practice, I’ve never seen an accused infringer take a harder line in the face of a potential injunction that could cripple its business,” San Diego patent attorney John Benassi
  • “The least likely thing to happen is that at 5 p.m. Friday (today) everybody’s BlackBerry is going to get shut off.” Scott Creasman, Powell Goldstein
  • “[Judge Spencer is] quick to make up his mind.” Jim Stuckey (Former clerk).
  • “There are no legal reasons why the judge shouldn’t [grant the injunction].” Richard Kelly, Oblon Spivak.
  • “If its software design-around was really a satisfactory option and plainly does not infringe, I believe they would have distributed it months ago.” George Wheeler, McAndrews Held Malloy.
  • “The judge does not appear phased by the [PTO’s] reexamination of the patents, and is not giving in to the government’s efforts to slow the process on hardship grounds.” Douglas Miro

Supreme Court to Determine Licensee’s Right to Sue for Declaratory Judgment of Invalidity or NonInfringement

ChimericImmunoglobulinMedImmune v. Genentech* (Supreme Court 2006).

The Supreme Court has granted certiorari to determine when a patent licensee in good standing can challenge the validity of a patent.  In two separate opinions, the CAFC dismissed MedImmune’s cases — holding that a licensee has no standing to sue for declaratory judgment because it is not under threat of being sued for patent infringement.

This issue harks back to the 1969 Lear v. Adkins case that limited the ability of a licensee to sign-away its right to later challenge the validity of a licensed patent.  In Lear, the High Court found that the public’s interest in invalidating bad patents was strong enough to warrant a limit on the licensee’s ability to give up its future right to challenge validity. 

The question presented is:

Does Article III’s grant of jurisdiction of “all Cases . . . arising under . . . the Laws of the United States,” implemented in the “actual controversy” requirement of the Declaratory Judgment Act, 28 U.S.C. 2201(a), require a patent licensee to refuse to pay royalties and commit material breach of the license agreement before suing to declare the patent invalid, unenforceable or not infringed?

* A second petition MedImmune v. Centocor is also pending before the Court with the parallel question of: 

Does the “actual controversy” requirement of the Declaratory Judgment Act, 28 U.S.C. 2201(a) require a material breach of a license agreement by a licensee prior to suit for declaratory relief for patent infringement, invalidity, or unenforceability?

Documents:

Links:

New IP Blogs

Link: The Intellectual Property Owners Association (IPO) is one of the most powerful and respected IP association. Marc Adler, president of the IPO has started a blog with the goal of providing a discussion forum for the IP community.

Link: The IP Institute at the University of Richmond Law School has started the “Richmond IP Blog” (beta) and appears to be focused primarily on tech-copyright issues.

Link: Mark Reichel, an associate at Ice Miller has started his “Daily Dose of IP.”

 

 

Design Patents: References are Properly Combined in Point of Novelty Test Without Motivation

AIPLATalk070Lawman Armor v. Winner Int’l (Fed. Cir. 2006, 05–1253).

To show infringement, a design patent holder must satisfy two separate tests: (a) the ‘ordinary observer’ test and (b) the ‘point of novelty’ test.

The “ordinary observer” test requires comparison of the two designs from the viewpoint of the ordinary observer to “determine whether the patented design as a whole is substantially the same as the accused design.” 

Under the “point of novelty” test, a court must determine whether “the accused device . . . appropriate[s] the novelty in the patented device which distinguishes it from the prior art.”

Regarding points of novelty — Lawman pointed to eight specific points of novelty of its patented design for the sliding hook portion of a vehicle lock. On summary judgment, the district court found that all eight points of novelty could be found in a combination of prior art references.  As a consequence, the lower court ruled that the patent was not infringed.

Lawman appealed, arguing that there was no suggestion to combine the references in the art.  The CAFC, however, affirmed, finding that, for the point of novelty test, multiple references can be combined without any prior suggestion or motivation for doing so.

What Lawman’s contention comes down to is that the D’621 patent contains a ninth “point of novelty,” namely, the combination in a single design of the eight non-novel “points of novelty” it embodies. This argument is inconsistent with, and would seriously undermine, the rationale of the “points of novelty” test.

Supreme Court Denies Phillips v. AWH Petition for Certiorari

Phillips v. AWH Corp. (Supreme Court).

The Supreme Court has denied AWH’s bid for certiorari on the question of whether “all aspects of a district court’s patent claim construction may be reviewed de novo on appeal.”  That single rule of law has often been cited as the primary reason for the unusually high reversal rate of patent cases.

Book Review: Math You Can’t Use

MathMath You Can’t Use
by Ben Klemens

$19 from Amazon

Klemens is a scholar, but doesn’t really write like one — rather he tells a story and wraps the story around his argument.  His bottom line argument is that software should not be patentable. Here are some of his arguments:

1) Software is simply math (Church-Turing thesis) and math is not patentable.  His conclusion — that software should therefore be unpatentable — strikes me as odd.  Klemens leads us down the parade of horribles of granting 15 years of exclusivity to mathematical algorithms.  The bad results are (a) mathematicians being forced to pay royalties when a patent is valuable and (b) the Church-Turing thesis itself being patented.

2) The PTO is bad at granting patents and therefore should not grant software patents.

3) Patents only work well in industries with a few major players.  The software industry is decentralized (with lots of small players) and therefore should not be covered by patents. . .

Of course, Klemens may gain more traction with his explanation of how aggressive patent enforcement could kill the internet as a whole.

Notes:

J. Newman: Inequitable Conduct Charges Again on the Rise

Ferring v. Barr Labs (Fed. Cir. 2006).

The Ferring decision seems to have again expanded the scope of inequitable conduct in patent cases.  In a twenty-page dissent, Judge Newman took issue with this expansion.

I agree with J. Newman that inequitable conduct is “a serious charge” that should not be taken lightly. In the past, the defense has been “grossly misused . . . with inequitable conduct charged in almost every case in litigation.”  Certainly, these charges do nothing to help the current popular distrust of the patent system.

After the CAFC decision in Kingsdown v. Hollister (requiring objective evidence of material misconduct + intent to deceive), charges of inequitable conduct were pushed to the background and taken-out of many cases. However, in this decision, Newman sees a revival:

My colleagues on this panel have regressed to that benighted era, rejecting the efforts of Kingsdown to bring objectivity to charges of inequitable conduct, instead reviving the culture of attack on inventor rights and attorney reputations based on inference and innuendo. My colleagues, endorsing several novel and unsupportable presumptions of wrongdoing, do injury to the reasonable practice of patent solicitation, even as they defy the rules of summary judgment.

Here, Newman argues, the panel has found materiality based on a “should have known ” standard:

The panel majority, steeped in adverse inferences, holds that good faith is irrelevant and presumes bad faith. Thus the court resurrects the plague of the past, ignoring the Kingsdown requirements of clear and convincing evidence of a misrepresentation or omission material to patentability, made intentionally and for the purpose of deception. I respectfully, but urgently, dissent.

Links:

PTO Requests Model of Warp Drive Invention

The Worsley-Twist warp drive does not depend upon traditional emissions of matter to create thrust.  Rather, the drive creates a change in the curvature of the space-time continuum — thus allowing travel by warping space-time.  Worsley & Twist patent application recently suffered another setback. The Examiner has now requested a working model:

Applicant is required to furnish a model of the instant invention. 35 U.S.C. 114. See Also 37 C.F.R. 1.91.

Among other rejections, the Examiner has asserted a rejection under 35 U.S.C. 101 for lack of utility — finding that the invention is inoperable.

PatentlyO066

Links:

More Interesting Patent Applications (From Keith Nagel)

  • U.S. Pub. No. / Title
  • 2005-110500 DEVICE FOR EXCHANGING TRANSMISSION AND RECEPTION OF FUTURE INFORMATION OF MULTI-WORLD IN-BETWEEN PAST
  • 2005-102494 GRAVITY CONTROL TIME MACHINE UTILIZING ACCELERATED MOTION TO WHICH GENERAL THEORY OF RELATIVITY IS APPLIED
  • 2005-101509 ULSI COMPRISING BINARY-NOTATION-SYSTEM ELEMENT FOR RETURNING ELEMENTARY PARTICLE OR ATOM TO PAST
  • 2004-197727 GENERATOR USING CASIMIR POWER SUCH THAT TWO METAL PLATES PARALLELLY PLACED IN SLIGHTLY SPACED RELATION IN VACUUM ATTRACT EACH OTHER
  • 2004-135253 APPARATUS FOR IRRADIATING EXCESS DIMENSION WITH GRAVITATIONAL WAVE USING BRANEWORLD THEORY IN BINARY NUMBER SYSTEM, TRANSMITTING-RECEIVING AND DECODING INFORMATION THEREFROM
  • 2004-080981 APPARATUS FOR RAPIDLY ROTATING SMALL-SIZED ROD WITH ACCELERATOR TO FORM SINGULAR POINT, TO GENERATE CTL, TO PLACE FUTURE INFORMATION OBJECT THEREON AND TO SEND IT TO PAST
  • 2004-032821 TRANSMITTER/RECEIVER TO PAST BY BINARY NOTATION SCALE OF FUTURE INFORMATION USING QUANTUM MECHANICS FOR RETURNING ELEMENTAL PARTICLE TO THE PAST
  • 2003-198642 DEVICE FOR TRANSMITTING FUTURE INFORMATION TO PAST BY INTEGRATING LEFT ELECTRON INTO MORSE SIGNAL SYSTEM BY USING INFORMATION TRANSMITTING SPEED ZERO SECOND OF SPIN OF ELECTRON BLEW OFF RIGHT AND LEFT
  • 2001-326969 FUTURE INFORMATION PAST TRANSMISSION/RECEPTION DOCUMENTING MACHINE UTILIZING LASER PULSE

Patentee Must Disclose Affiliations of Declarants

Ferring v. Barr Labs. (Fed. Cir. 2006).

By Grantland Drutchas

Ferring is a rather interesting CAFC decision on inequitable conduct. The CAFC affirmed summary judgment of inequitable conduct based solely on the applicant’s failure to disclose that individuals who submitted declarations in support of the patentability of the claims had affiliations with the assignee of the application.

One of the declarants was an employee of the assignee, one was a paid consultant; but the third was simply a researcher (presumably a clinician) whose employer had assisted with some clinical studies for the assignee and received some funding for those clinical studies from the assignee. The CAFC found the failure to disclose each of these relationships was material.

The appellate panel also held that an inference of intent can be found when the patentee fails to show a “credible explanation” for the patentee’s deception of the PTO. Importantly, the Court found that the patent holder has the burden to prove the credible explanation. Simply arguing plausible or possible explanations for the deception is not enough to rebut an inference of intent to deceive.

Grant Drutchas, a founding partner of MBHB, has nearly 20 years of experience in the practice of intellectual property law, with a particular emphasis on litigation, licensing, and client counseling.

Patent Cases in the Northern District of Illinois

This morning I conducted a quick study to determine some case outcomes here in the Northern District of Illinois.  Since 2000, 933 patent cases have been filed here and 783 of those have closed. The following table breaks down the number of patent cases filed by year and, of those, how many have been closed.

AIPLATalk065
* as of 2/16/2006.

Using the data from patent cases filed in 2000, I then created the following table to show how long each case took to close.  About 8% of the cases were disposed of within a month of filing.

AIPLATalk063

The following table shows that most patent cases are closed before the one-year mark, and 75% are done before two years have gone by.

AIPLATalk064

Cite as Dennis Crouch, Patent Cases in the Northern District of Illinois, Patently-O, February 16, 2006, available at https://patentlyo.com.

Appellate Procedure: No Cross-Claims for Winning Party on Winning Issues

AIPLATalk061Nautilus v. ICON (Fed. Cir. 2006, 05–1577o).

ICON won on summary judgment.  On appeal, ICON filed a cross-appeal requesting review of several claim construction rulings in the event the CAFC reversed the lower court’s ruling. However, the appellate panel refused to hear ICON’s arguments for new claim construction because ICON won below:

a party who prevails on noninfringement has no right to file a ‘conditional’ cross-appeal to introduce new arguments or challenge a claim construction, but may simply assert alternative grounds in the record for affirming the judgment.

AIPLATalk062In dissent, Judge Newman essentially argued that the practical nature of claim construction appeals should allow all claim construction issues to be reviewed at one time.

The burden on the district court and the parties, requiring them to conduct a trial on un-reviewed claim constructions, when objections have been raised and are ripe for review, is an entirely unnecessary burden.

 

Knorr-Bremse does not Preclude Inference of Reckless Behavior for Failure to Obtain Opinion

AIPLATalk060Golden Blount v. Robert H. Peterson Co. (Fed. Cir. 2006, 04–1609).  

Opinions of Counsel: This case holds that Knorr-Bremse does not prevent a court from finding that a defendant was at least reckless by obtaining an oral noninfringement opinion but failing to obtain a written opinion.  Rather, Knorr-Bremse only precludes an inference that an undisclosed written opinion would have been negative.

Damages: The defendant here was on the hook for contributory infringement — actual infringement occurred when customers assembled the fireplaces.  On damages, the CAFC partially reversed the lower court’s ruling.  The appellate panel found that lost-profit damages must be reduced by any products that were returned to the defendant without being opened by the customer — because in those cases the underlying direct infringement never occurred.

 Links:

Filed Briefs:

Court Reverses Claim Construction that Placed “Too Much Emphasis on the Ordinary Meaning”

Curtiss-Wright Flow Control Corp. v. Velan, Inc. (Feb. 15, 2006: 05-1373)

By Peter Zura

Velan appealed the lower court’s grant of a preliminary injunction in part over the construction of the term “adjustable” in the claimed feature reciting “an adjustable dynamic, live loaded seat coupled to said main body.”

In the preliminary injunction order, the trial court concluded that the bias force on the live loaded seat could be changed in a manner that is “not limited by any time, place, manner or means of adjustment.” In reaching this conclusion, the trial court relied on the ordinary meaning of “adjustable” to be “capable of making a change to something or capable of being changed.” The trial court refrained from further narrowing the term, alleging that claim differentiation prohibited the court from doing so, and also alleged that further limitations would impermissibly narrow the claim to the structure of the preferred embodiment.

The Federal Circuit, while commending the lower court’s restraint, disagreed. After applying a Phillips analysis to the claims in light of the specification, the Federal Circuit concluded that the disclosure defined the term “adjustable” to mean that the dynamic, live loaded seat can be adjusted while the de-heading system is in use.

Furthermore, the Federal Circuit reasoned that the district court’s construction of “adjustable” rendered that limitation nearly meaningless:

This court finds it difficult, if not impossible, to imagine any mechanical device that is not “adjustable,” under the ordinary meaning of that term adopted by the district court. Almost any mechanical device undergoes change (for instance, when dismantled to replace worn parts) when no consideration is given to the “time, place, manner, or means of adjustment.”

Thus, while the district court may have been correct that a device encompassed by claim 14 of the ’714 patent need not have an adjustment mechanism, it went too far in completely eliminating any constraints on the “adjustable” limitation. Moreover, the district court’s construction actually creates a redundancy: if “adjustable” means adjustable at any time and in any way, it is hard to imagine any meaning for the term because without limitations on time or manner of adjustment, all structures are “adjustable.”

Regarding the issue of claim differentiation between independent claims, the Federal Circuit provided that two considerations generally govern this claim construction tool when applied to two independent claims:

(1) claim differentiation takes on relevance in the context of a claim construction that would render additional, or different, language in another independent claim superfluous; and

(2) claim differentiation “can not broaden claims beyond their correct scope.

Finding that both of these considerations weighed against the district court’s construction, the preliminary injunction was vacated and the case was remanded.

(Published with permission)

Court Upholds Dual Patent/Copyright Protection for Software

Aharonian v. Gonzales (N.D.Cal. 2006).

Although he operates primarily through an e-mail list rather than through a website, Greg Aharonian is the honorary trailblazer for today’s intellectual property law blogs (including Patently-O).  He is also an activist.

In a lawsuit filed against the U.S. Government, Aharonian requested a declaratory judgment that copyright law cannot be applied to sourcecode.

Specifically, Aharonian hopes to build a powerful database of sourcecode to be used as a prior art repository — but does not want to be held liable for copyright infringement.  In a challenge to the statute, Aharonian argued that computer code is entirely made up of “algorithms” and “data structures,” both of which are uncopyrightable “ideas” or “processes” and additionally that the vague language of the Copyright Act is insufficient to support sourcecode copyrights. (And raised other arguments).

Standing: With any DJ action, there is often a question of standing. Here Aharonian was able to show that he was suffering a specific economic harm under the law (inability to build his database) and that economic harm, according to the court, was sufficient to establish standing.

This is not to say that all allegations of economic harm related to copyright law will be sufficient to meet the constitutional requirements for standing. For example, the mere assertion of a desire to copy, with no showing of an actual past or future business practice or actual economic benefit from copying, would not suffice. Here, however, plaintiff has an existing business which involves searching for potentially copyrighted prior art, and he has made a credible argument that incorporating (i.e. copying) such material into an automated search tool would result in additional profits.

Software as Math: The Aharonian machine will apparently transform computer code into a standardized logic framework and store that framework.  The court used that pont to avoid addressing the question head-on:

It would be unwise indeed for this court to make sweeping general pronouncements about the nature of software or the relationship between patent and copyright law, particularly where making such a pronouncement would have no clear effect on plaintiff’s ability to create his proposed database.

The court did take pains to distinguish patent and copyright cases — thus predicting their conclusion that both forms of protection are available for software:

A declaration that software consists entirely of “ideas”—data structures and algorithms—has no bearing on the applicability of copyright law to software source code, which, like all copyrightable material, is a particular written expression of ideas. . . . In sum, if plaintiff copies source code that is protected by copyright law, he infringes the copyright regardless of whether the ideas underlying the source code are patentable. Conversely, if plaintiff independently creates software that is functionally identical to other software, he does not infringe any copyright on the other software’s source code, even if his independently created source code is nearly identical to the copyrighted source code.

Vague Statute: On the issues of vagueness, the court essentially found that prior controlling precedent had interpreted the scope of the statute — leaving no room for the district court to hold otherwise.

Dismissed. The case is now on appeal.

Links:

  • Link: Website dedicated to the lawsuit.

Blogging Law and Blogging for Lawyers

I would like to invite you to the upcoming conference on Blog Law and Blogging for Lawyers to be held April 20–21 in San Francisco. LINK.

I am very excited to be the co-chair of the conference, which is the first comprehensive CLE to look at blogging both as a marketing tool for attorneys and as a legal area.  My co-chair Cathy Kirkman of Wilson Sonsini is a great attorney and full of ideas in this area.

Sample Topics:

  • Legal gray areas arising from the proliferation of Web logs
  • The future of blogging — a passing fad or here to stay?
  • The extent to which bloggers qualify for the First Amendment protections afforded to journalists
  • Content ownership and syndication issues
  • Employment issues arising from blogging within corporations
  • The latest in blogging technology, including audio and video feeds
  • How to set up a blog for your law firm or make your current blog more effective
  • How blogs differ from regular Web sites in generating traffic — and business — for your firm
  • Ethics questions surrounding the blog as a law firm marketing tool
  • PLUS an on-the-ground report from several law firm bloggers

We have been lucky with the help of Law Seminars International (LSI) to put together an amazing faculty and the peer group of bloggers and attending attorneys will make this a very special event. 

Feel free to contact me with any questions.
Dennis Crouch

Conference Links:

Other Links:

  • Link: Kevin O’Keefe discusses the conference
  • Link: Kevin Heller focuses on the conference is a clear sign that the “Big Law” players have arrived in the world of legal blogging.
  • Link: Denise Howell blinks.

CAFC Explains Materiality Standard for Inequitable Conduct

AIPLATalk056

Digital Control (DCI) v. Charles Machine Works (aka DitchWitch) (Fed. Cir. 2006).

By Mark Chael,

DCI appealed the lower courts’ decision that its patents were unenforceable for inequitable conduct. DCI’s three asserted patents involve Horizontal Directional Drilling, which enables the creation of horizontal holes in the ground through with utility lines can be placed by allowing a worker to locate and/or orient the boring tool as it moves through the ground.

The district court previously awarded partial summary judgment to DitchWitch finding that there was no genuine issue of material fact that misstatements and omissions made by the inventor during prosecution of the patents were material. After a bench trial, the lower court held that the misstatements and omissions were made with intent to deceive and the level of materiality and inference of intent were both high. Thus, the lower court held that the patents were unenforceable.

The CAFC, however, held there were genuine issue of material fact regarding the materiality of the inventor’s failure to disclose prior art. The CAFC thus vacated the district court’s ruling that the patents were unenforceable and remanded for further proceedings regarding the materiality of the failure to disclose prior art.

Before reviewing the lower court’s determination that DitchWitch was entitled to summary judgment on the issue of materiality, the CAFC addressed the proper standard for determining whether a misstatement by omission is material. What follows in the text of the opinion is a comprehensive, yet succinct, summary of the development and current standing of the law of inequitable conduct and material misrepresentation, in view of the Patent Office’s amendment of Rule 56 (duty of candor and good faith / duty of disclosure). This panel followed the “reasonable examiner” materiality standard of old Rule 56, which “new Rule 56 was not intended to replace or supplant.”

Dr. Mark Chael’s prior research in biochemistry, molecular biology, and cellular biology make him well equipped to understand the intricacies involved in biotech and pharmaceutical patents. He is an associate at the intellectual property law firm McDonnell Boehnen Hulbert & Berghoff in Chicago.

Links:

Read the opinion.

Patently-O TidBits

1) Continuation Practice: Matt Buchanan at Promote-The-Progress has posted slides from the PTO’s town-hall meeting.

2) APLF: Patent Judges Panel in Des Moines: The Association of Patent Law Firms (APLF) is pleased to present a discussion of patent litigation featuring a distinguished panel of judges.  Titled “Impressions and Observations of Patent Trial and Markman Hearings,” the event will be held March 9 from 12-1:30 p.m. at Drake University Law School in Des Moines.  For reservations and information on payment options, please visit http://media.aplf.org/conferences/drakeroundtable.php.

3) Chicago Bar Assn: On March 1st, 2006, I will be at a CBA Young Lawyers luncheon talking about blogging and blog-law with fellow weblog author Evan Brown.

4) Patent Law Symposium: Northwestern’s Journal of Technology will hold its first symposium: “Patent Litigation in the 21st Century” on February 24, 2006 at its downtown campus. Featured Speakers include Professor Matthew Sag, Peter Zura, Ken Withers, and Hal Wegner. Link.

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(via www.thehughpage.com).