Granted Patent
Utility
US 4,325,021 · App. 06/190,987
Regulated switching apparatus
Inventor:
John B. McMackin
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Sep 26, 1980
Inventor
John B. McMackin
Assignee (at issue)
RCA Corporation
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.