Granted Patent
Utility
US 4,498,741 · App. 06/364,257
Compact, wide magnification-variable zoom lens system
Inventor:
Shozo Ishiyama
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Apr 1, 1982
Inventor
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.