Granted Patent
Utility
US 4,353,657 · App. 06/081,586
Ribbon feed mechanism and correction tape feed mechanism for a typewriter
Inventor:
John O. Schaefer
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Oct 3, 1979
Inventor
John O. Schaefer
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.