Granted Patent
Utility
US 4,272,201 · App. 06/122,800
Ribbon shaper for typewriter cartridge
Inventor:
Donald J. Steger
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Feb 19, 1980
Inventor
Donald J. Steger
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.