AVA INTERNATIONAL CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5,295,907 Rorque limiting deviceExpiredDec 09, 92Mar 22, 94[F16K, F16D]
4,745,971 Multiple string well packerExpiredJun 03, 85May 24, 88[F21B]
4,726,421 Latching devicesExpiredMar 17, 87Feb 23, 88[E21B]
4,605,064 Well apparatusExpiredMar 05, 85Aug 12, 86[E21B]
4,505,331 Side pocket mandrelExpiredNov 08, 82Mar 19, 85[E21B]
4,488,595 Well tool having a slip assemblyExpiredJun 23, 83Dec 18, 84[E21B]
4,467,866 Flow controlling apparatusExpiredMar 17, 82Aug 28, 84[E21B]
4,440,223 Well slip assembliesExpiredOct 22, 82Apr 03, 84[E21B]
4,434,847 Flow controlling apparatusExpiredMar 17, 82Mar 06, 84[E21B]
4,407,363 Subsurface well apparatusExpiredFeb 17, 81Oct 04, 83[E21B]
4,393,929 Well packers and slip assemblies for use therewithExpiredFeb 17, 81Jul 19, 83[E21B]

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