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Is there a chance that the Unisys patent is actually invalid?

April 26, 2017actually chance invalid patent unisys

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Is there a chance that the Unisys patent is actually invalid?

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In 1994, the U.S Patent Office reexamined the Welch patent and, on January 4th of that year, not only confirmed the patentability of the original 181 patent claims, but also confirmed that 51 claims added during the reexamination were also patentable.