Granted Patent
Utility
US 4,554,559 · App. 06/504,104
Thermal print head
Inventor:
John S. Heath
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Jun 14, 1983
Inventor
John S. Heath
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.