Granted Patent
Utility
US 6,028,487 · App. 08/939,879
Negative-feedback amplifier circuit capable of independently controlling a gain and an impedance
Inventors:
Yuji Kakuta, Yasuhiro Shirakawa, Yoshiaki Fukasawa, Yoshiaki Wakabayashi
Patented Case
View Patent ↗
Granted: Feb 22, 2000
Filed: Sep 29, 1997
Inventors
Yuji Kakuta
Yasuhiro Shirakawa
Yoshiaki Fukasawa
Yoshiaki Wakabayashi
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.