PRODUCTION TECHNOLOGIES INTERNATIONAL, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5207273 Method and apparatus for pumping wellsExpiredSep 17, 90May 04, 93[E21B]
4861074 Tubing collarExpiredMay 06, 88Aug 29, 89[F16L]
4716960 Method and system for introducing electric current into a wellExpiredJul 14, 86Jan 05, 88[H01R, E21B]

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