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USPTO Upholds Pair of WARF, Geron Stem Cell Patents
The US Patent and Trademark Office has upheld the validity of the two most important stem cell patents assigned to the Wisconsin Alumni Research Foundation and exclusively licensed by Geron, WARF and Geron said this week.
The USPTO specifically upheld US Patent Nos. 5,843,780 and 6,200,806, which respectively claim preparations of primate and human embryonic stem cells and methods for their isolation.

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