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:
Feb. 14, 2012
Filed:
Feb. 27, 2009
Andrew B. Levy, West Linn, OR (US);
Greg K. Justice, Vancouver, WA (US);
Ricardo G. Diaz, Vancouver, WA (US);
Chris Arnold, Vancouver, WA (US);
Mark A. Devries, Albany, OR (US);
Andrew B. Levy, West Linn, OR (US);
Greg K. Justice, Vancouver, WA (US);
Ricardo G. Diaz, Vancouver, WA (US);
Chris Arnold, Vancouver, WA (US);
Mark A. DeVries, Albany, OR (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
An ink delivery system includes a plurality of ink supplies, an air pressure source to generate ink pressure for each ink supply, an ink valve associated with each ink supply, where each ink valve is configured to prevent a reverse flow of ink from a pen to the associated ink supply, and each ink valve has a switch configured to provide an open signal when the ink valve is open, and a controller configured to determine one of a normal ink condition, an out of ink condition or a system pressure problem based on receiving the open signals and to regulate the pressure source according to the determination.