Granted Patent
Utility
US 4,488,212 · App. 06/469,561
Voltage limit protection circuit for phase controlled rectifiers
Inventor:
Charles E. Rettig
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Feb 28, 1983
Inventor
Charles E. Rettig
Assignee (at issue)
Magnetek, 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.