Granted Patent
Utility
US 6,177,839 · App. 09/253,828
Variable gain amplifier circuit
Inventor:
Hisaya Ishihara
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Feb 19, 1999
Inventor
Hisaya Ishihara
Assignee (at issue)
NEC 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.