Granted Patent
Utility
US 4,407,593 · App. 06/356,705
Arrangement for monitoring the operation of the ink ribbon of an ink-ribbon magazine
Inventor:
Johannes Haftmann
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Mar 10, 1982
Inventor
Johannes Haftmann
Assignee (at issue)
Nixdorf Computer AG
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.