Granted Patent
Utility
US 4,616,670 · App. 06/725,147
High-low pressure pilot
Inventors:
John W. Duffy, Robert A. Funke, David W. Shollenbarger
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Apr 22, 1985
Inventors
John W. Duffy
Robert A. Funke
David W. Shollenbarger
Assignee (at issue)
Fisher Controls International LLC
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.