Granted Patent
Utility
US 4,931,348 · App. 07/091,222
Reduced thickness resin substrate in film printing ribbon
Inventors:
David R. Klueh, Jack William Morris, Kent G. Urdahl, Matthew Zimmer
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Aug 31, 1987
Inventors
David R. Klueh
Jack William Morris
Kent G. Urdahl
Matthew Zimmer
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.