Granted Patent
Utility
US 4,205,206 · App. 05/886,156
Carbon granule microphone with molded resin-conductive carbon electrode
Inventors:
Tetsusuke Eishima, Takehiro Ikariyama, Raizo Jinnouchi, Kunioki Oyagi, Takashi Soda
Patented Case
View Patent ↗
Granted: May 27, 1980
Filed: Mar 13, 1978
Inventors
Tetsusuke Eishima
Takehiro Ikariyama
Raizo Jinnouchi
Kunioki Oyagi
Takashi Soda
Assignees (at issue)
Iwatsu Electric Co., Ltd.
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.