FORMATION PRESERVATION, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5992544 Fire suppression apparatus for well drilling systemExpiredMar 26, 99Nov 30, 99[E21B]
5975219 Method for controlling entry of a drillstem into a wellbore to minimize surge pressureExpiredApr 23, 98Nov 02, 99[E21B]
5890549 Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatusExpiredDec 23, 96Apr 06, 99[A62C, E21B]

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