Granted Patent
Utility
US 4,247,263 · App. 05/747,501
Pump assembly incorporating vane pump and impeller
Inventors:
Karl H. Pech, George W. Jahrstorfer
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Dec 6, 1976
Inventors
Karl H. Pech
George W. Jahrstorfer
Assignee (at issue)
Chandler Evans 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.