Granted Patent
Utility
US 4,542,281 · App. 06/585,724
Thermal printer contrast control
Inventor:
Leslie L. Thompson
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Mar 2, 1984
Inventor
Leslie L. Thompson
Assignee (at issue)
Combustion Engineering, Inc.
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.