At 02:56 PM 9/4/2001 , F. Craig Callahan wrote:
>Roger Wong wrote:
>You're saying that Canon's patent expired? Wow. Has USM really been around for 20
>years? That's how long it takes for a patent to expire.
>
>That would be in the U.S. What about in Japan?
They also last for 20 years. So, USM is at least 20 years old. Wow.
Canon's IS patent can't be 20 years old. I guess that Nikon Vibration Reduction uses a
substantially different method from Canon Image Stabilization.
Japanese patent office homepage (in english): <http://www.jpo.go.jp/>
(this has to be the *cutest* government webpage in the world!)
-Roger
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