Granted Patent
Utility
US 4,473,280 · App. 06/543,233
Audio-visual cartridge and combined audio player and visual viewer
Inventor:
Marcel J. H. Staar
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Oct 21, 1983
Inventor
Marcel J. H. Staar
Assignee (at issue)
Staar S.A.
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.