Granted Patent
Utility
US 4,457,591 · App. 06/354,901
Single operator macro-focusing zoom lens barrel
Inventors:
Takeshi Muryoi, Hitoshi Imanari
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Mar 4, 1982
Inventors
Takeshi Muryoi
Hitoshi Imanari
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.