Granted Patent
Utility
US 4,496,576 · App. 06/531,064
Compositions of p-hydroxybenzoic acid esters and methods of preparation and use
Inventors:
Donald F. Loncrini, Thomas E. Haag, Steven R. Freebersyser
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Sep 12, 1983
Inventors
Donald F. Loncrini
Thomas E. Haag
Steven R. Freebersyser
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.