In reference to the patent: WO2002019867A1

Is this patent still valid and if so when does it expire? Does it cover U.S.?

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The document in question is an international ("PCT") application; it is not a granted patent. This application was never brought into the US as a national phase application.

There is a time limit of 30 months to bring this application into the US:

This application, filed in September 2000, is long past that deadline. In short, this application has not and will not become a granted patent in the US or anywhere else.

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