Granted Patent
Utility
US 6,494,553 · App. 09/878,490
Ink level sensing for ink printer
Inventors:
Frederick A. Donahue, Richard E. Butts, Ronald C. Macera
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Jun 11, 2001
Inventors
Frederick A. Donahue
Richard E. Butts
Ronald C. Macera
Assignee (at issue)
Xerox 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.