Granted Patent
Utility
US 5,546,232 · App. 08/258,992
Two-group zoom lens
Inventor:
Jun Hirakawa
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Jun 13, 1994
Inventor
Jun Hirakawa
Assignee (at issue)
Asahi Kogaku Kogyo Kabushiki Kaisha
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.