Granted Patent
Utility
US 4,357,258 · App. 06/199,718
Stable emulsions of p-hydroxybenzoic acid esters and method of preparation
Inventors:
Thomas E. Haag, Steven R. Freebersyser, Donald F. Loncrini
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: Oct 23, 1980
Inventors
Thomas E. Haag
Steven R. Freebersyser
Donald F. Loncrini
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.