Granted Patent
Utility
US 4,396,262 · App. 06/325,577
Hand held transparency projector with simple advance mechanism
Inventors:
Vitolds Laizans, John J. Richardson
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Nov 30, 1981
Inventors
Vitolds Laizans
John J. Richardson
Assignee (at issue)
View-Master International Group
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.