Granted Patent
Utility
US 5,618,779 · App. 08/581,571
Triglyceride-based base oil for hydraulic oils
Inventors:
Johann Klein, Frank Bongardt, Peter Daute, Matthias Fies
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Feb 8, 1996
Inventors
Johann Klein
Frank Bongardt
Peter Daute
Matthias Fies
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.