Granted Patent
Utility
US 4,436,862 · App. 06/504,156
Thermally stable thickener
Inventors:
Marvin T. Tetenbaum, Burlon C. Crowley
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Jun 14, 1983
Inventors
Marvin T. Tetenbaum
Burlon C. Crowley
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.