Granted Patent
Utility
US 4,330,179 · App. 06/148,814
Variable magnification projection device
Inventor:
Shiro Sato
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: May 12, 1980
Inventor
Shiro Sato
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.