Granted Patent
Utility
US 5,331,464 · App. 07/861,520
Zoom lens system
Inventors:
Takayuki Ito, Sachio Hasushita
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Apr 1, 1992
Inventors
Takayuki Ito
Sachio Hasushita
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.