Granted Patent
Utility
US 4,387,381 · App. 06/273,250
Optical recording medium and information record with tracking aid
Inventor:
Alan E. Bell
Patented Case
View Patent ↗
Granted: Jun 7, 1983
Filed: Jun 12, 1981
Inventor
Alan E. Bell
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.