Inventor · disambiguated record
Percy W. Schumacher
Also filed as: HOLLINGSHEAD FRANK A · SCHUMACHER JR PERCY W · SCHUMACHER PERCY W
15 granted patents·887 citations·filing 1975–1991
95Inventor score
Top patents by PatentIndex Score
15 records- 0195US4334586AInserts for drilling bitsREED ROCK BIT CO·Filed 1980·Granted Jun 15, 1982·152 cites·10 claims
- 0292US4444281ACombination drag and roller cutter drill bitREED ROCK BIT CO·Filed 1983·Granted Apr 24, 1984·118 cites·6 claims
- 0391US4940099ACutting elements for roller cutter drill bitsREED TOOL CO·Filed 1989·Granted Jul 10, 1990·113 cites·2 claims
- 0489US4611673ADrill bit having offset roller cutters and improved nozzlesREED ROCK BIT CO·Filed 1983·Granted Sep 16, 1986·89 cites·14 claims
- 0586US4657093ARolling cutter drill bitREED ROCK BIT CO·Filed 1982·Granted Apr 14, 1987·70 cites·6 claims
- 0684US4907662ARotary drill bit having improved mounting means for multiple cutting elementsREED TOOL CO·Filed 1987·Granted Mar 13, 1990·44 cites·10 claims
- 0783US4682663AMounting means for cutting elements in drag type rotary drill bitREED TOOL CO·Filed 1986·Granted Jul 28, 1987·67 cites·13 claims
- 0868US5080183ASeal assembly for roller cutter drill bit having a pressure balanced lubrication systemCAMCO INT·Filed 1991·Granted Jan 14, 1992·48 cites·13 claims
- 0966US4158973ARolling cutter drill bitREED TOOL CO·Filed 1978·Granted Jun 26, 1979·18 cites·2 claims
- 1065US4623028ASeal assembly for drill bitsREED TOOL CO·Filed 1985·Granted Nov 18, 1986·36 cites·13 claims
- 1159US5040624ASeal assembly for roller cutter drill bit having a pressure balanced lubrication systemSCHUMACHER PERCY W·Filed 1990·Granted Aug 20, 1991·40 cites·11 claims
- 1257US4446935AIntermittent high-drag oil well drilling bitREED TOOL CO·Filed 1982·Granted May 8, 1984·23 cites·7 claims
- 1356US4830123AMounting means for cutting elements in drag type rotary drill bitREED TOOL CO·Filed 1987·Granted May 16, 1989·25 cites·5 claims
- 1456US4794994ADrag drill bit having improved flow of drilling fluidREED TOOL CO·Filed 1987·Granted Jan 3, 1989·26 cites·15 claims
- 1554US3971600ADrill bitREED TOOL CO·Filed 1975·Granted Jul 27, 1976·18 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →