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By: Reuters | 01 Jul 2009 | 04:29 AM ET
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A U.S. patent research group says it has uncovered evidence that could be used to declare AstraZeneca's patent for its cholesterol fighter Crestor invalid.

AstraZeneca [AZN-LN  Loading...      ()] is involved in litigation to defend the Crestor patent from generic drugmakers that want to bring a cheaper copy to the U.S. market.

The patent group, Article One Partners, did not say who found the prior art, essentially information describing the patented technology that dates from before the patent application.

Discovery of good prior art would make defending a patent considerably more difficult.

CNBC.com

Article One said the person is eligible to win an award of up to $50,000.

A similar discovery by Article One, launched by CEO Cheryl Milone last year, led to a patent office decision last month to reexamine a patent for Merck's [MRK  Loading...      ()   ] blockbuster Singulair asthma and allergy drug.

Article One encourages researchers and experts in various fields to identify evidence related to patent validity.

Those who succeed are paid and the collected evidence is sold to the group's clients.

Copyright 2009 Reuters. Click for restrictions.
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