Roger Wong wrote:
> 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.
Are you sure? It is possible that the IS patent was granted well before the first
commercial IS lenses were introduced, and didn't Canon's IS binoculars
come to market some time before the first IS lenses?
fcc
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