WR Grace Says Propex Concrete Fibers Violate Patents

By Ama Sarfo (November 8, 2012, 3:19 PM EST) -- Bankrupt chemical conglomerate W.R. Grace & Co. on Tuesday lodged a patent infringement suit in Delaware federal court against Propex Operating Co. LLC, claiming the company is infringing technology used in W.R. Grace's reinforcing fibers for concrete structures....

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