Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids

Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids

US Patent 6281172 · Granted Aug 28, 2001

Estimated economic value: $1,269,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Filler for papermaking process2015
Use of CMC in drilling fluids2011
Drilling fluid2008
Drilling fluid2008
Hydrophobically modified anionic cellulose ethers2003
Method of making amide modified carboxyl-containing polysaccharide and fatty ami2000
Analgesic substituted piperidylidene-2-sulfon(cyan)amide derivatives1984