Granted Patent
Utility
US 4,867,095 · App. 07/177,710
Differential pressure indicator
Inventors:
Bruce E. Shane, Keith D. Leady, Wayne L. Conner, Albert F. Cella
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Apr 5, 1988
Inventors
Bruce E. Shane
Keith D. Leady
Wayne L. Conner
Albert F. Cella
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.