Granted Patent
Utility
US 4,401,813 · App. 06/331,299
Process for preparing alkali metal salt of carboxymethyl cellulose
Inventors:
Jack L. Lowell, Michael J. Nevins, Kenneth I. G. Reid, Kenneth L. Walter
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Dec 10, 1981
Inventors
Jack L. Lowell
Michael J. Nevins
Kenneth I. G. Reid
Kenneth L. Walter
Assignee (at issue)
NL Industries, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.