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Purina sues over patented additives

A closely held pet-food maker sued by Nestle, which owns St. Louis-based Purina, for patent-infringement said it was using the technology in dispute for years before the world’s largest food company sought patent protection. Wysong Corp., of Midland, Mich., filed court papers March 2 claiming that Nestle’s patent 5,968,569 is invalid and not infringed. Nestle sued ...

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