Granted Patent
Utility
US 4,253,775 · App. 06/053,164
Apparatus for re-inking a ribbon in a thermal transfer printing system
Inventors:
Walter Crooks, Keith S. Pennington
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Jun 29, 1979
Inventors
Walter Crooks
Keith S. Pennington
Assignee (at issue)
IBM 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.