Granted Patent
Utility
US 4,421,389 · App. 06/308,110
Macro zoom lens barrel
Inventor:
Takeshi Muryoi
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Oct 2, 1981
Inventor
Takeshi Muryoi
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.