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Jessup Manufacturing Asserts AfterGlow’s Photoluminescent Exit Sign Patents Are Invalid & Unenforceable

In an amended answer filed with the U.S. District Court for the Northern District of Illinois last month, Jessup Manufacturing Company, in addition to denying any infringement on two patents for photoluminescent devices controlled by AfterGlow, LLC, Jessup asserts a counterclaim asserting the it can’t be infringing because the patents are invlid and unenforceable. AfterGlow,…

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