Granted Patent
Utility
US 5,167,844 · App. 07/606,401
Lubricant formulations
Inventors:
Rolf Schumacher, Horst Zinke
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Oct 31, 1990
Inventors
Rolf Schumacher
Horst Zinke
Assignee (at issue)
Ciba-Geigy
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.