Granted Patent
Utility
US 4,688,161 · App. 06/887,367
Regulated power supply apparatus and method using reverse phase angle control
Inventor:
John Covington
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Jul 16, 1986
Inventor
John Covington
Assignee (at issue)
Vari-Lite, 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.