Granted Patent
Utility
US 4,591,244 · App. 06/500,395
Zoom lens
Inventors:
Yasuhiro Aono, Koichi Matsumoto
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Jun 2, 1983
Inventors
Yasuhiro Aono
Koichi Matsumoto
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.