Granted Patent
Utility
US 4,293,135 · App. 06/124,391
Segmented seal
Inventor:
Joseph E. Wallace
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Feb 25, 1980
Inventor
Joseph E. Wallace
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.