Granted Patent
Utility
US 4,448,495 · App. 06/359,436
Zoom lens system capable of very close range photography
Inventor:
Kiyoshi Hayashi
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Mar 18, 1982
Inventor
Kiyoshi Hayashi
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.