Granted Patent
Utility
US 4,247,254 · App. 05/972,639
Turbomachinery blade with improved tip cap
Inventor:
John W. Zelahy
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Dec 22, 1978
Inventor
John W. Zelahy
Assignee (at issue)
General Electric Company
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.