Granted Patent
Utility
US 4,569,798 · App. 06/449,960
Amphoteric surface active monomers
Inventor:
Edward C. Y. Nieh
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Dec 15, 1982
Inventor
Edward C. Y. Nieh
Assignee (at issue)
Texaco 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.