Granted Patent
Utility
US 4,685,864 · App. 06/790,200
Hollow aerofoil blade
Inventors:
James P. Angus, Derick A. Perry
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Oct 22, 1985
Inventors
James P. Angus
Derick A. Perry
Assignee (at issue)
ROLLS-ROYCE plc
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.