Granted Patent
Utility
US 6,293,143 · App. 09/534,828
Ink level sensing device and method therefor
Inventors:
Gary Allen Denton, Wilson Routt
Patented Case
View Patent ↗
Granted: Sep 25, 2001
Filed: Mar 23, 2000
Inventors
Gary Allen Denton
Wilson Routt
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.