Granted Patent
Utility
US 4,622,153 · App. 06/115,405
Liquid polymer containing compositions for thickening aqueous systems
Inventors:
Kenneth Watson, Keith W. Sharp
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jan 25, 1980
Inventors
Kenneth Watson
Keith W. Sharp
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.