Granted Patent
Utility
US 4,270,132 · App. 06/029,217
Information record
Inventor:
Alan E. Bell
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Apr 12, 1979
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.