Granted Patent
Utility
US 4,915,586 · App. 07/246,832
Propfan blade attachment
Inventor:
James R. Williams
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Sep 20, 1988
Inventor
James R. Williams
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.