Granted Patent
Utility
US 5,689,288 · App. 08/261,589
Ink level sensor
Inventors:
Guenther W. Wimmer, Richard S. Meissner, David L. Knierim
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Jun 17, 1994
Inventors
Guenther W. Wimmer
Richard S. Meissner
David L. Knierim
Assignee (at issue)
Tektronix, 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.