Plainsman Technology, Inc.

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5887653 Method for clay stabilizationExpiredAug 15, 97Mar 30, 99[E21B]
5445221 Controlling ferric ions while acidizing subterranean formationsExpiredApr 21, 94Aug 29, 95[E21B]

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