Granted Patent
Utility
US 4,375,339 · App. 06/211,886
Electrically conductive ribbon break detector for printers
Inventors:
Stanley Dyer, James J. Molloy, Donald A. Walker
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: Dec 1, 1980
Inventors
Stanley Dyer
James J. Molloy
Donald A. Walker
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.