EVI CHERRINGTON ENVIRONMENTAL, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5301561 Method and apparatus for taking a fluid sampleExpiredMay 28, 91Apr 12, 94[E21B]
5253720 Method and apparatus for taking an undisturbed core sampleExpiredJun 13, 91Oct 19, 93[E21B]
5209605 Gravel-packed pipeline and method and apparatus for installation thereofExpiredNov 08, 91May 11, 93[F16L]
5176207 Underground instrumentation emplacement systemExpiredJul 26, 91Jan 05, 93[E21B]
5148875 Method and apparatus for horizontal drillingExpiredSep 24, 91Sep 22, 92[E21B]
5074366 Method and apparatus for horizontal drillingExpiredJun 21, 90Dec 24, 91[E21B]
5040601 Horizontal well bore systemExpiredJun 21, 90Aug 20, 91[E21B]

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