Granted Patent
Utility
US 5,147,884 · App. 07/479,126
Preservative for aqueous products and systems
Inventors:
Karl-Heinz Diehl, Peter Oltmanns
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Feb 12, 1990
Inventors
Karl-Heinz Diehl
Peter Oltmanns
Assignee (at issue)
Sterling Drug, Inc.
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.