Granted Patent
Utility
US 4,655,558 · App. 06/632,103
Rear focus conversion lens apparatus
Inventor:
Yoshinari Hamanishi
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Jul 18, 1984
Inventor
Yoshinari Hamanishi
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.