In 1899, then Patent Commissioner, Charles H. Duell reportedly announced that "everything that can be invented has been invented." Obviously, he is wrong. Case in point – I just got a call from an inventor at a major corporation who wants to patent his invention:
Disclosure: A ladder with Teflon rungs — so that you don’t stick on your way up & down.
(Its a joke). Patent law humor is very funny to a select group of people. For those of you who are members of that unlucky group, follow these links:
Prior-Art-O-Matic (keep hitting refresh).
Let me know if there are any sites I’m missing.
Update I: The Petit Musee de Marques is, as its name implies, a little museum of trademarks. Frédéric Glaize writes this blog in french, but it can be translated using the Google translator. (Thanks to Cece Gassner for the tranlation link).