Granted Patent
Utility
US 4,523,868 · App. 06/514,407
Ribbon feed cartridge
Inventor:
David Shadwick
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Jul 18, 1983
Inventor
David Shadwick
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.