Granted Patent
Utility
US 4,813,802 · App. 07/092,546
Device for verifying if thermal printer is operating correctly
Inventors:
Dennis T. Gilham, Raymond John Herbert
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Sep 3, 1987
Inventors
Dennis T. Gilham
Raymond John Herbert
Assignee (at issue)
Alcatel Business Systems
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.