Granted Patent
Utility
US 4,323,979 · App. 06/068,010
Cartridge and bezel assembly for a calculator
Inventor:
John N. Johnston
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Aug 20, 1979
Inventor
John N. Johnston
Assignee (at issue)
Litton Business Systems, Inc.
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.