Granted Patent
Utility
US 4,644,148 · App. 06/858,538
Focus detecting apparatus
Inventors:
Yosuke Kusaka, Jun Shimomura
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Apr 29, 1986
Inventors
Yosuke Kusaka
Jun Shimomura
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.