Granted Patent
Utility
US 4,401,393 · App. 06/439,009
Printer ribbon cassette and feed mechanism
Inventors:
Douglas E. Alexander, Charles M. McCray
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Nov 4, 1982
Inventors
Douglas E. Alexander
Charles M. McCray
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.