Granted Patent
Utility
US 5,053,448 · App. 07/384,360
Polymeric thickener and methods of producing the same
Inventor:
Sheng-Liang Tsaur
Patented Case
View Patent ↗
Granted: Oct 1, 1991
Filed: Jul 21, 1989
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.