Granted Patent
Utility
US 4,697,622 · App. 06/874,790
Passive filling device
Inventors:
William Swift, Robert E. Fischell
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Jun 13, 1986
Inventors
William Swift
Robert E. Fischell
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.