Granted Patent
Utility
US 4,367,764 · App. 06/257,464
By-pass valve improvement
Inventors:
John Barry Fitzgerald, George York
Patented Case
View Patent ↗
Granted: Jan 11, 1983
Filed: Apr 24, 1981
Inventors
John Barry Fitzgerald
George York
Assignee (at issue)
ACF Industries Incorporated
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.