Granted Patent
Utility
US 4,336,450 · App. 06/112,350
Focus detecting apparatus
Inventors:
Ken Utagawa, Akira Ogasawara, Hiroshi Shirasu, Kunihisa Hoshino
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Jan 15, 1980
Inventors
Ken Utagawa
Akira Ogasawara
Hiroshi Shirasu
Kunihisa Hoshino
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.