Granted Patent
Utility
US 4,918,725 · App. 07/276,154
Terminal impedance setting circuit for a two-wire to four-wire converting circuit
Inventor:
Kiyoh Takahashi
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Nov 23, 1988
Inventor
Kiyoh Takahashi
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.