Granted Patent
Utility
US 4,474,449 · App. 06/417,169
Automatic focusing device
Inventor:
Yosuke Kusaka
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Sep 13, 1982
Inventor
Yosuke Kusaka
Assignee (at issue)
Nippon Kagaku 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.