Granted Patent
Utility
US 4,678,701 · App. 06/793,525
Resistive printing ribbon having improved properties
Inventors:
Keith S. Pennington, Ali Afzali-Ardakani, Krishna G. Sachdev
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Oct 31, 1985
Inventors
Keith S. Pennington
Ali Afzali-Ardakani
Krishna G. Sachdev
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.