NL Petroleum Products Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4928777 Cutting elements for rotary drill bitsExpiredNov 05, 87May 29, 90[E21B]
4823892 Rotary drill bitsExpiredNov 09, 87Apr 25, 89[E21B]
4804049 Rotary drill bitsExpiredNov 30, 84Feb 14, 89[E21B]
4790396 Rotary drill bits for use in coring holes in subsurface formationsExpiredJun 26, 86Dec 13, 88[E21B]
4781256 Cutting structures for rotary drill bitsExpiredJun 30, 87Nov 01, 88[E21B]
4762028 Rotary drill bitsExpiredMay 05, 87Aug 09, 88[B21K]
4733735 Rotary drill bitsExpiredSep 29, 86Mar 29, 88[E21B]
4720371 Rotary drill bitsExpiredApr 21, 86Jan 19, 88[B22F]
4718505 Rotary drill bitsExpiredJul 12, 85Jan 12, 88[E21B]
4705122 Cutter assemblies for rotary drill bitsExpiredJan 14, 86Nov 10, 87[E21B]
4700790 Rotary drill bitsExpiredFeb 26, 85Oct 20, 87[E21B]
4699227 Method of forming cutting structures for rotary drill bitsExpiredDec 12, 85Oct 13, 87[B21K, E21B]
4697654 Rotary drill bitsExpiredJul 12, 85Oct 06, 87[E21B]
4694919 Rotary drill bits with nozzle former and method of manufacturingExpiredJan 22, 86Sep 22, 87[E21B]
4679639 Rotary drill bits and cutting elements for such bitsExpiredNov 30, 84Jul 14, 87[E21B]
4669522 Manufacture of rotary drill bitsExpiredApr 01, 86Jun 02, 87[B22D]
4577706 Rotary drill bitsExpiredMay 10, 84Mar 25, 86[E21B]

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