Granted Patent
Utility
US 5,089,841 · App. 07/584,753
Device for automatically changing magnification of camera zoom lens
Inventor:
Masatoshi Yamada
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Sep 19, 1990
Inventor
Masatoshi Yamada
Assignee (at issue)
Chino Corporation
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.