Granted Patent
Utility
US 4,319,094 · App. 06/124,632
Three-terminal power supply circuit for telephone set
Inventors:
Tatsuhiro Naganawa, Makoto Yoshitoshi, Kunihiro Kato
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Feb 25, 1980
Inventors
Tatsuhiro Naganawa
Makoto Yoshitoshi
Kunihiro Kato
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.