The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1998
Filed:
Nov. 21, 1995
Applicant:
Inventors:
George Barbehenn, Vancouver, WA (US);
Martin K Mason, Andover, MA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ; G01F / ;
U.S. Cl.
CPC ...
347-7 ; 367 99 ; 7386118 ;
Abstract
The present invention relates generally to inkjet printing mechanisms, and more particularly to an ultrasonic method for monitoring the ink level in an ink reservoir for an ink jet cartridge. This ultrasonic method includes the steps of sending an ultrasonic signal towards the ink reservoir, and receiving a series of reflected ultrasonic signals from the reservoir. In a processing step, the series of received reflected ultrasonic signals are processed in order to determine the ink level in the reservoir.