David Friedman has a list of celebrity patents over at Ironic Sans. The inventors range from Zeppo Marx to Michael Jackson to Abraham Lincoln. My two favorites are Samuel Clemens' (Mark Twain) self-pasting scrap book (U.S. Patent No. 140,245) and George Lucas' design patent on Yoda (U.S. Patent No. D265,754).
I get this question as often as any other TiVo owner. Now Lex Friedman has answered it for me: