The U.S. District Court for the district of Delaware has affirmed a ruling in favor of Acushnet in its long-standing patent dispute with Callaway Golf. Starting in 2006, Callaway claimed that Acushnet's Titleist Pro V1 golf balls violated several of its patents; Acushnet countered that the patents were invalid and shouldn't have been issued. In March 2010 a jury found that the patents were invalid because they were obvious, and the District Court judge upheld that decision. This comes after the U.S. Patent and Trademark Office ruled last month that the patents were invalid. This closes the case in District Court, but Callaway can still appeal to a Federal Circuit Court.

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