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:
Mar. 28, 2000
Filed:
Aug. 27, 1997
Jules G Moritz, III, Corvallis, OR (US);
Patrick J Coven, Albany, OR (US);
Dustin W Blair, San Diego, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An inkjet printhead includes multiple printing elements grouped in sets about an ink refill channel. Each printing element includes a nozzle chamber and firing resistor. Respective nozzle chambers are located at a staggered distance away from the ink refill channel. A printing element's feed channel couples its nozzle chamber to the ink refill channel. A pinch point defined by barrier walls occurs along the feed channel. Converging and diverging half angles for each barrier wall of a given printing element are the same. Such angles differ among a plurality of printing elements. The specific angle for a given printing element defines where along the feed channel the pinch point occurs. The specific angle is prescribed according to the distance from a given printing element's firing resistor to the ink refill channel. A certain angle is used for a certain resistor stagger position to provide ink refill balancing among printing elements.