Granted Patent
Utility
US 5,121,153 · App. 07/634,481
Automatic focusing device
Inventors:
Masatoshi Yamada, Takamichi Takehana
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Dec 26, 1990
Inventors
Masatoshi Yamada
Takamichi Takehana
Assignee (at issue)
501 Chinon Kabushiki Kaisha
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.