In his recent article “Patent and Trademark Searching Via the Web,” Robert Ambrogi provides a concise guide for using the Internet to find both U.S. and international patents and trademarks. Robert’s first stops are the USPTO and the EPO. These sites are free, easy to use, and fairly comprehensive. Several fee-based services, such as Delphion and Micropatent are good second options if a more comperhensive search is required. Finally, Robert mentions the ROSSCO website that provides a matrix of patent search options.
Mr. Ambrogi is a lawyer in Massachusetts and author of The Essential Guide to the Best (and Worst) Legal Sites on the Web. In a recent article, he was kind enough to mention Patently-O, hopefully one of the best.