Granted Patent
Utility
US 4,338,001 · App. 06/153,787
Telephoto lens system
Inventor:
Sei Matsui
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: May 27, 1980
Inventor
Sei Matsui
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.