Granted Patent
Utility
US 6,412,894 · App. 09/766,363
Ink cartridge and method for determining ink volume in said ink cartridge
Inventors:
Benjamin Alan Askren, William Paul Cook
Patented Case
View Patent ↗
Granted: Jul 2, 2002
Filed: Jan 19, 2001
Inventors
Benjamin Alan Askren
William Paul Cook
Assignee (at issue)
Lexmark International, 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.