Granted Patent
Utility
US 4,320,170 · App. 06/213,984
Polyurethane ribbon for non-impact printing
Inventor:
Hugh T. Findlay
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Dec 8, 1980
Inventor
Hugh T. Findlay
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.