Granted Patent
Utility
US 4,575,731 · App. 06/666,414
Electro resistive printhead drive level sensing and control
Inventor:
Frank J. Horlander
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Oct 30, 1984
Inventor
Frank J. Horlander
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.