IP Library › Granted Patent US 4,402,621
Granted Patent Utility
US 4,402,621 · App. 06/305,764

Ribbon cartridge with ribbon guide arms

Inventors: William A. Abell, Jr., James A. Craft, Michael Lee Morris
Patented Case View Patent ↗
Granted: Sep 6, 1983 Filed: Sep 25, 1981
Inventors
William A. Abell, Jr.
James A. Craft
Michael Lee Morris
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,402,621
App. No.
06/305,764
Filed
1981-09-25
Granted
1983-09-06
Kind
A