Granted Patent
Utility
US 5,670,472 · App. 08/450,473
Biodegradable ester diquaternary compounds and compositions containing them
Inventor:
Robert O. Keys
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: May 26, 1995
Inventor
Robert O. Keys
Assignee (at issue)
Witco 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.