REED TOOL COMPANY LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5174396 Cutter assemblies for rotary drill bitsExpiredOct 31, 88Dec 29, 92[E21B]
5165494 Rotary drills bitsExpiredNov 21, 90Nov 24, 92[E21B]
5119892 Notary drill bitsExpiredNov 21, 90Jun 09, 92[E21B]
5109935 Rotary drill bitsExpiredNov 21, 90May 05, 92[E21B]
5101691 Methods of manufacturing cutter assemblies for rotary drill bitsExpiredFeb 14, 90Apr 07, 92[B21K, E21B]
5099934 Rotary drill bitsExpiredNov 21, 90Mar 31, 92[E21B]
5060739 Cutter assemblies for rotary drill bits, and method of manufacturing sameExpiredJan 26, 90Oct 29, 91[B23K, E21B]
4991670 Rotary drill bit for use in drilling holes in subsurface earth formationsExpiredNov 08, 89Feb 12, 91[E21B]
4987800 Cutter elements for rotary drill bitsExpiredJun 26, 89Jan 29, 91[B21K, E21B]
4919220 Cutting structures for steel bodied rotary drill bitsExpiredJan 25, 88Apr 24, 90[E21B]
4878403 Manufacture of rotary drill bitsExpiredNov 02, 88Nov 07, 89[B21K]
4862977 Drill bit and cutter thereforExpiredMar 31, 87Sep 05, 89[E21B]
4848491 Rotary drill bitsExpiredNov 19, 87Jul 18, 89[E21B]
4844185 Rotary drill bitsExpiredNov 10, 87Jul 04, 89[E21B]
4780274 Manufacture of rotary drill bitsExpiredOct 24, 86Oct 25, 88[B22F]
4669556 Drill bit and cutter thereforExpiredJan 25, 85Jun 02, 87[E21B]
4624830 Manufacture of rotary drill bitsExpiredNov 30, 84Nov 25, 86[B22F]
4570725 Drill bit cutterExpiredJan 31, 84Feb 18, 86[E21B]

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