Granted Patent
Utility
US 5,539,503 · App. 08/359,221
Magnetic drive for a liquid toner cartridge and the liquid supply system for the cartridge
Inventor:
Wallace K Johnson
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Dec 19, 1994
Inventor
Wallace K Johnson
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.