Granted Patent
Utility
US 4,299,540 · App. 06/000,272
Tail rotor blade
Inventors:
Cecil E. Covington, Ronnie L. Martin
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jan 2, 1979
Inventors
Cecil E. Covington
Ronnie L. Martin
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.