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This question already has an answer here:

In reference to the patent: US20020111572

marked as duplicate by DonQuiKong, Robert Cartaino Jun 5 '17 at 12:13

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This is a patent application, not a patent. It was abandoned in 2003 so at this point it seems unlikely it will ever be a patent. You can determine this for yourself at the US Public Pair site.

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