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Bernard Lang wrote:

> contains a report on the Unisys GIF business. But you all know it.
>
> It got me to wonder however. Why did Unisys wait so long to enforce
> the patent it got in 1985, that was unknowingly infringed in 87 by
> Compuserve.

Is it not true that a holder of a patent has to defend it from infringement in
order for it to stay valid? So if they did not start enforcing until 95 it
should not be valid.

Andreas








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