Granted Patent
Utility
US 5,670,160 · App. 08/649,254
Preservatives and their use
Inventors:
Heinz Eggensperger, Karl-Heinz Diehl, Peter Oltmanns
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Jan 30, 1996
Inventors
Heinz Eggensperger
Karl-Heinz Diehl
Peter Oltmanns
Assignee (at issue)
Schulke & Mayr GmbH
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.