Granted Patent
Utility
US 4,935,751 · App. 07/410,771
Level sensor for ink bag
Inventor:
Mindy A. Hamlin
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Sep 21, 1989
Inventor
Mindy A. Hamlin
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.