Granted Patent
Utility
US 4,143,398 · App. 05/888,932
Automatic brightness control circuit employing a closed control loop stabilized against disruption by large amplitude video signals
Inventors:
Leopold A. Harwood, Erwin J. Wittmann
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Mar 22, 1978
Inventors
Leopold A. Harwood
Erwin J. Wittmann
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.