Granted Patent
Utility
US 4,257,744 · App. 06/022,403
Impeller and shaft assembly for high speed gas compressor
Inventor:
Thomas E. Watson
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Mar 21, 1979
Inventor
Thomas E. Watson
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.