Granted Patent
Utility
US 4,506,849 · App. 06/388,413
Helicopter rotor thrust ring
Inventor:
Harold E. Lemont
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Jun 14, 1982
Inventor
Harold E. Lemont
Assignee (at issue)
Textron 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.