Granted Patent
Utility
US 5,073,591 · App. 07/583,411
Polymeric thickeners and methods of producing the same
Inventor:
Sheng-Liang Tsaur
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Sep 17, 1990
Inventor
Sheng-Liang Tsaur
Assignee (at issue)
S. C. JOHNSON & SON, 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.