Granted Patent
Utility
US 4,329,073 · App. 06/213,718
Single use ribbon cartridge with frangible resistive element for restraining the takeup spool
Inventor:
James A. Craft
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: Dec 8, 1980
Inventor
James A. Craft
Assignee (at issue)
International Business Machines 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.