Granted Patent
Utility
US 4,370,551 · App. 06/242,886
Focus detecting device
Inventors:
Toru Fukuhara, Ken Utagawa
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Mar 12, 1981
Inventors
Toru Fukuhara
Ken Utagawa
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.