Oil Rig Makers Can't Duck Suit By Nixing Exhaust Patent

By Dan Prochilo (May 24, 2013, 8:38 PM EDT) -- A Texas federal judge on Thursday affirmed the validity of an L.C. Eldridge Sales Co. Inc. patent for an oil-rig exhaust system, shooting down arguments that the patent was indefinite made by several rig manufacturers and owners that Eldridge has sued for infringement....

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