Granted Patent
Utility
US 4,336,824 · App. 06/154,592
Cartridge valve
Inventor:
Robert J. Steineman
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: May 29, 1980
Inventor
Robert J. Steineman
Assignee (at issue)
United Aircraft Products, Inc.
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.