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This is true despite the fact that prior to filing a patent application a thorough search is typically performed, looking for any publication that might block a patent from issuing, and that a patent application is only filed when chances for obtaining a patent appear good.
FORBES: Keep the Current Standard for Invalidating a Patent
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Some patent examiners have been at the patent office for decades, and have a vast storehouse of knowledge regarding what has previously been described in a printed publication (and thereby serves to block a patent grant).
FORBES: Keep the Current Standard for Invalidating a Patent
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Amgen is trying to block Roche by suing the company for patent infringement.
FORBES: Magazine Article
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Toyota Motor , the leader in hybrid vehicles, has settled a patent-infringement dispute that had threatened to block the sale of the best-selling Prius and other Toyota hybrids.
FORBES: Toyota Settles Hybrid Patent Case
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If one of these companies had been allowed to patent a gene for the enzyme the statins block, the others would have likely been asked to look elsewhere for drugs.
FORBES: Magazine Article
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Last week, the Commission utilized another, very troubling route to pursue its crusade: it injected its views on these patent litigation arrangements into a proposed settlement of a complaint it had filed to block a merger between two drug companies, Perrigo Company and Paddock Laboratories.
FORBES: FTC Orders Merged Drug Companies Not to Do "Pay-for-Delay" Settlements
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On October 22nd, Pfizer won a new, broad patent on Viagra, its anti-impotence drug, in America and sued Lilly to block the launch of Cialis, its longer-lasting alternative.
ECONOMIST: Despite its poor results, Lilly's future may be rosy