Granted Patent
Utility
US 4,323,461 · App. 06/197,055
Process of inhibiting scale formation in aqueous systems using di-quaternary ammonium salts of .alpha.-1,4-thiazine alkanephosphonic acids
Inventor:
Patrick M. Quinlan
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Oct 14, 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.