Granted Patent
Utility
US 5,568,547 · App. 08/261,281
Subscriber circuit provided with a circuit for monitoring a subscriber instrument
Inventor:
Kouichi Nishimura
Patented Case
View Patent ↗
Granted: Oct 22, 1996
Filed: Jun 15, 1994
Inventor
Kouichi Nishimura
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.