Granted Patent
Utility
US 4,248,721 · App. 05/954,255
Synthetic aircraft turbine oil
Inventor:
Roberta Yaffe
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Oct 24, 1978
Inventor
Roberta Yaffe
Assignee (at issue)
Texaco Inc.
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.