Granted Patent
Utility
US 4,669,700 · App. 06/733,050
Pilot operated valve
Inventor:
William E. Seidel
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: May 13, 1985
Inventor
William E. Seidel
Assignee (at issue)
Sundstrand 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.