Granted Patent
Utility
US 4,737,882 · App. 07/012,473
Proportional solenoid valve control circuit
Inventor:
Anthony Mario D'Onofrio
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Feb 9, 1987
Inventor
Anthony Mario D'Onofrio
Assignee (at issue)
Honeywell Limited
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.