Granted Patent
Utility
US 4,394,723 · App. 06/275,075
Power supply circuit
Inventor:
John P. Hoffman
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Apr 30, 1981
Inventor
John P. Hoffman
Assignee (at issue)
Caterpillar Tractor Co.
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.