Granted Patent
Utility
US 4,397,446 · App. 05/844,867
Integral seal
Inventor:
Jerry G. Jelinek
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Oct 25, 1977
Inventor
Jerry G. Jelinek
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.