Granted Patent
Utility
US 4,142,979 · App. 05/852,885
Lubricating compositions containing bispiperazido phosphorus and trispiperazido phosphorus compounds
Inventor:
Johny C. Hermans
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Nov 18, 1977
Inventor
Johny C. Hermans
Assignee (at issue)
S.A. Texaco Belgium N.V.
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.