Granted Patent
Utility
US 4,501,475 · App. 06/381,311
Zoom lens
Inventors:
Hisao Fujita, Shozo Ishiyama
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: May 24, 1982
Inventors
Hisao Fujita
Shozo Ishiyama
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.