Do patent attorneys do patent work for a contingency fee?
Some will, but generally the role of a patent attorney is not that of an investor. In most cases, patent attorneys will only accept a percentage of royalties or accept an ownership interest in a patent if the invention has great promise, and obviously, the inventor may not want to give up his or her upside for the mere cost of filing and prosecuting a patent application. The practice of accepting contingency fees is somewhat more prevalent in litigation. In any case, the inventor should select patent litigation counsel carefully.