I had not realized that so many search tools are available for those who want to find patents. If you want to find out more about them, Intellogist can make your research and decision process easier. Intellogist is a free service from Landon IP with more than 30 reviews of popular patent search systems. You can also share your knowledge and expertise on these systems.
Here are the patent search offerings mentioned on Intellogist: Delphion; EAST; Esp@cenet; FreePatentsOnline; Google Patent Search; MicroPatent; PatentWeb; PatAnalyst; PatBase; PatBase Express; Patent Analysis Search System; Patent Lens; QPAT; Qweb; SumoBrain; SureChem; Surf-IP; Thomson Innovation; TotalPatent; and WIPS Global (See my post of Jan. 3, 2009: law departments and patents for management systems and software.).