Granted Patent
Utility
US 4,449,791 · App. 06/292,436
Three-group zoom lens
Inventors:
Hidenori Terasawa, Kiyoshi Hayashi
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Aug 14, 1981
Inventors
Hidenori Terasawa
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.