Granted Patent
Utility
US 4,725,039 · App. 07/026,892
Self-pressure regulating proportional valve
Inventor:
Abel E. Kolchinsky
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Mar 17, 1987
Inventor
Abel E. Kolchinsky
Assignee (at issue)
Clevite Industries 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.