Granted Patent
Utility
US 4,312,373 · App. 06/133,035
Internal valve
Inventors:
Basil B. Tilling, Henry A. Swindler
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Mar 24, 1980
Inventors
Basil B. Tilling
Henry A. Swindler
Assignee (at issue)
Parker-Hannifin Corporation
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.