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:
Sep. 26, 1989
Filed:
Jul. 28, 1988
Alan S Campbell, Lexington, KY (US);
Jerome M Eldridge, Los Gatos, CA (US);
Francis C Lee, San Jose, CA (US);
Graham Olive, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An array of resistive heater elements, each of which is connected in an electrical circuit between a common electrode and one of the control electrodes. Each of the resistive heater elements comprises a plurality of portions arranged so that a small elongated opening in provided at the middle of the heater element where no resistive material is present. Each of the resistive heater elements, when energized, has a bubble formed at each of the plurality of portions. All of the bubbles coalesce to form a single pillow-shaped bubble which causes a drop of ink to be ejected from the associated nozzle. During collapse of the bubble, the bubble collapses inwardly so that cavitational shock impacts the heater element at the opening and little or no damage to the resistive heater is produced.