Last night I watched the documentary "Who Killed the Electric Car". Pretty good for a documentary! I have a question from the movie, although you don't need to have seen the movie to answer it:
Are the NiMH batteries used in Toyota hybrid vehicles the same (Ovonic batteries) as those used in the EV1 after its 2nd year?
The moviemaker interviewed the inventor of the "Ovonic NiMH battery, Stanford Ovshinsky, and his wife. General Motors selected his company as the battery supplier to replace Delco batteries used initially in the EV1. After GM stopped manufacturing and repossessed all the EV1 vehicles on the road, GM sold the battery company or technology patent (unclear from the movie) to Texaco, now merged with Chevron. According to an MIT website, Ovshinsky (or his company ECD, unclear from the website) was awarded a patent on the NiMH battery in 1994.
So if Toyota uses similar NiMH batteries, are they paying royalties to Chevron on every Prius, Highlander, Camry, Lexus... hybrid? There's very little information about this on the web, especially new information, although this site says Ovshinsky's wife passed away in 2006 and Panasonic lost a patent judgement to ECD: