Granted Patent
Utility
US 4,822,189 · App. 07/112,367
Drive arrangement for a ribbon cassette
Inventors:
Wilfried Dobring, Peter Gull
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Oct 22, 1987
Inventors
Wilfried Dobring
Peter Gull
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.