Granted Patent
Utility
US 4,988,074 · App. 07/194,787
Proportional variable force solenoid control valve
Inventor:
Hamid Najmolhoda
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: May 17, 1988
Inventor
Hamid Najmolhoda
Assignee (at issue)
Hi-Ram, 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.