Granted Patent
Utility
US 4,306,834 · App. 06/051,912
Balance piston and seal for gas turbine engine
Inventor:
Richard M. Lee
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Jun 25, 1979
Inventor
Richard M. Lee
Assignee (at issue)
Westinghouse Electric Company 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.