Granted Patent
Utility
US 4,697,909 · App. 06/840,470
Power source device with reserve power source for camera
Inventors:
Kiyosada Machida, Yoshiyuki Nakano, Nobuo Matsukawa
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Mar 13, 1986
Inventors
Kiyosada Machida
Yoshiyuki Nakano
Nobuo Matsukawa
Assignee (at issue)
Nippon Kogaku K.K.
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.