Granted Patent
Utility
US 4,380,740 · App. 06/202,485
Current amplifier
Inventor:
Leonard Kaplan
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Oct 31, 1980
Inventor
Leonard Kaplan
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.