Granted Patent
Utility
US 4,840,469 · App. 07/114,581
Telephoto zoom lens
Inventor:
Keiji Moriyama
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Oct 30, 1987
Inventor
Keiji Moriyama
Assignee (at issue)
NIKON 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.