Granted Patent
Utility
US 4,891,934 · App. 07/264,575
Oil system for gas turbine engine
Inventor:
David S. Huelster
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Oct 31, 1988
Inventor
David S. Huelster
Assignee (at issue)
General Motors LLC
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.