Granted Patent
Utility
US 4,680,144 · App. 06/924,340
Benzene sulfonate quaternary ammonium salts of organic sunscreen carboxylic acids
Inventor:
Donald E. Conner
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Oct 29, 1986
Inventor
Donald E. Conner
Assignee (at issue)
MALLINCKRODT LLC
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.