Granted Patent
Utility
US 4,828,407 · App. 07/055,734
Circuit for improving the resolution in electrostatic printers
Inventor:
James Hack
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: May 29, 1987
Inventor
James Hack
Assignee (at issue)
Sanders GmbH
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.