Granted Patent
Utility
US 4,692,551 · App. 06/887,298
Preparation of carboxypropylated non-ionic surfactants
Inventor:
Kou-Chang Liu
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Jul 23, 1986
Inventor
Kou-Chang Liu
Assignee (at issue)
GAF Corporation
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.