Granted Patent
Utility
US 4,491,700 · App. 06/325,056
Hybrid circuit in a telephone subscriber interface circuit
Inventors:
Toshiyuki Tahara, Hironobu Uehara, Kazuo Hamazato, Toshio Hayashi
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Nov 25, 1981
Inventors
Toshiyuki Tahara
Hironobu Uehara
Kazuo Hamazato
Toshio Hayashi
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.