TiVo had a strange way of saying good-bye to its co-founder and Chief Technology Officer. Instead of issuing a press release with warm comments about the guy who helped to pioneer the DVR — and, perhaps, an explanation for why he’s leaving and who might replace him — the company dropped the news today in a cold SEC filing. It says that Barton resigned on Wednesday, effective today. It also outlined his new $25,000 a month consulting deal with TiVo. He will help with “patent matters, litigation, and certain technical matters” for three years “unless earlier terminated by either Mr. Barton or the company.” Responding to a call about the matter, Tivo sent along this comment from CEO Tom Rogers: “We are extremely grateful to Jim for his years of dedication and his commitment to innovation that he has provided to TiVo since its founding. We are pleased that he will remain on in an advisory capacity and look forward to working with him in this new capacity in the future.” The company says that Barton “is headed off to pursue his next ‘big idea’.”  Barton was a top executive with Silicon Graphics when he teamed up in 1997 with a fellow exec there, Michael Ramsay, to create TiVo. They introduced their DVR at the 1999 Consumer Electronics Show.