Inventor · disambiguated record
Charles D. Williamson
Also filed as: WILLIAMSON CHARLES D
8 granted patents·375 citations·filing 1986–1991
91Inventor score
Files withNALCO CHEMICAL CO8
Top patents by PatentIndex Score
8 records- 0192US5028271AVinyl grafted lignite fluid loss additivesNALCO CHEMICAL CO·Filed 1990·Granted Jul 2, 1991·73 cites·14 claims
- 0288US5134215AMethod for reducing fluid loss from oilfield cement slurries using vinyl grafted wattle tanninNALCO CHEMICAL CO·Filed 1990·Granted Jul 28, 1992·50 cites·10 claims
- 0388US4938803AVinyl grafted lignite fluid loss additivesNALCO CHEMICAL CO·Filed 1989·Granted Jul 3, 1990·55 cites·22 claims
- 0488US4678591ATerpolymer composition for aqueous drilling fluidsNALCO CHEMICAL CO·Filed 1986·Granted Jul 7, 1987·58 cites·3 claims
- 0585US5147964AMethod for reducing fluid loss from oilfield cement slurries using vinyl grafted wattle tanninNALCO CHEMICAL CO·Filed 1991·Granted Sep 15, 1992·53 cites·10 claims
- 0681US4997581AAdditive and method for temporarily reducing permeability of subterranean formationsNALCO CHEMICAL CO·Filed 1988·Granted Mar 5, 1991·33 cites·18 claims
- 0770US5032297AEnzymatically degradable fluid loss additiveNALCO CHEMICAL CO·Filed 1989·Granted Jul 16, 1991·21 cites·11 claims
- 0870US5009267AMethod for temporarily reducing permeability of subterranean formationsNALCO CHEMICAL CO·Filed 1990·Granted Apr 23, 1991·32 cites·14 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →