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:
Oct. 25, 2011
Filed:
Sep. 19, 2005
Jianhui Gu, Singapore, SG;
Rio Rivas, Corvallis, OR (US);
Jeremy Harlan Donaldson, Corallis, OR (US);
Bernard a Rojas, Singapore, SG;
Jianhui Gu, Singapore, SG;
Rio Rivas, Corvallis, OR (US);
Jeremy Harlan Donaldson, Corallis, OR (US);
Bernard A Rojas, Singapore, SG;
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A method of forming an opening through a substrate includes defining an area on a first surface of the substrate where the opening is to be formed, the area having a center region flanked by edge regions. A top layer having a substantially closed space located over the area is formed on the first surface. Structure for promoting etching of the center region is provided, and the first surface of the substrate is etched in the area. In one embodiment, the method can fabricate an inkjet printhead having a substrate having an ink feed hole formed therethrough and an orifice plate formed thereon. A plurality of particle tolerance elements located over a center region of the ink feed hole promoted etching during the fabrication of the printhead.