Inventor
WILLIAMSON CHARLES D
US8 patents
Patents
8 patentsUS5147964ASep 15, 1992
Method for reducing fluid loss from oilfield cement slurries using vinyl grafted wattle tannin
NALCO CHEMICAL CO53 citations95
US5028271AJul 2, 1991
Vinyl grafted lignite fluid loss additives
NALCO CHEMICAL CO73 citations95
US4938803AJul 3, 1990
Vinyl grafted lignite fluid loss additives
NALCO CHEMICAL CO55 citations95
US4678591AJul 7, 1987
Terpolymer composition for aqueous drilling fluids
NALCO CHEMICAL CO58 citations94
US5134215AJul 28, 1992
Method for reducing fluid loss from oilfield cement slurries using vinyl grafted wattle tannin
NALCO CHEMICAL CO50 citations92
US5009267AApr 23, 1991
Method for temporarily reducing permeability of subterranean formations
NALCO CHEMICAL CO32 citations92
US4997581AMar 5, 1991
Additive and method for temporarily reducing permeability of subterranean formations
NALCO CHEMICAL CO33 citations92
US5032297AJul 16, 1991
Enzymatically degradable fluid loss additive
NALCO CHEMICAL CO21 citations81