Granted Patent
Utility
US 4,383,311 · App. 06/199,314
Optical recording medium and information record with indented overcoat
Inventor:
Michael Ettenberg
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Oct 21, 1980
Inventor
Michael Ettenberg
Assignee (at issue)
RCA Corporation
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.