Granted Patent
Utility
US 4,772,405 · App. 06/895,985
Lubricant compositions which contain sulfur-containing phenol derivatives, and novel sulfur-containing phenol derivatives
Inventor:
Hermann O. Wirth
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Aug 14, 1986
Inventor
Hermann O. Wirth
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.