Granted Patent
Utility
US 4,740,807 · App. 06/860,646
Focal length switching type camera
Inventors:
Yasushi Hoshino, Masamori Makino
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: May 7, 1986
Inventors
Yasushi Hoshino
Masamori Makino
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.