Granted Patent
Utility
US 4,648,480 · App. 06/766,433
Condenser microphone having resistance against high-temperature and radioactive rays
Inventors:
Kenshu Watanabe, Kiminori Shiba, Mikiya Arai, Masaya Yamaguchi, Yasuo Fujiki, Ryohei Fujimoto
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Aug 16, 1985
Inventors
Kenshu Watanabe
Kiminori Shiba
Mikiya Arai
Masaya Yamaguchi
Yasuo Fujiki
Ryohei Fujimoto
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.