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. 19, 1995
Filed:
Dec. 22, 1992
David W Swanson, Escondido, CA (US);
James L Ruder, Escondido, CA (US);
Timothy J Carlin, San Diego, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A rigid external case structure for a thermal ink-jet pen cartridge, which includes an ink reservoir within the case. The case includes an external frame structure made of an engineering plastic, and defining an open loop, with opposed open areas defined on each opposed side of the loop. Two opposed thin metal side cover plates are attached to the frame structure to cover the open areas, and provide rigidity to the case structure. As a result, the frame structure is substantially non-compressible in response to forces applied against the side members or against the frame, protecting the ink reservoir and preventing ink drool from the pen printhead.