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:
Nov. 20, 2012
Filed:
Apr. 29, 2010
Applicant:
Spencer R. Hanson, Escondido, CA (US);
Inventor:
Spencer R. Hanson, Escondido, CA (US);
Assignee:
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J 2/175 (2006.01);
U.S. Cl.
CPC ...
Abstract
In one embodiment, a system for delivering liquid to a printhead at a first elevation. The system includes a reservoir to hold liquid at a second elevation, which is below the first elevation. A pump delivers liquid from the reservoir to the printhead through a first line. A bypass valve diverts liquid from the first line when a pressure in the first line exceeds a predefined pressure. A vent coupled to the printhead at or above the first elevation vents the printhead to atmospheric pressure when the pump is off.