Granted Patent
Utility
US 4,494,977 · App. 06/187,390
Quaternary ammonium salts of .alpha.-1,4-thiazine alkanephosphonic acids
Inventor:
Patrick M. Quinlan
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Sep 15, 1980
Inventor
Patrick M. Quinlan
Assignee (at issue)
Petrolite 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.