Granted Patent
Utility
US 4,947,136 · App. 07/408,678
Variable gain distributed amplifier
Inventor:
David R. Helms
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Sep 18, 1989
Inventor
David R. Helms
Assignee (at issue)
General Electric Company
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.