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. 29, 2002
Filed:
Feb. 12, 2001
Neal W. Meyer, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The present invention provides an improved inkjet printhead assembly adapted to reduce and/or withstand the collapse of ink back into the firing chambers. In one embodiment, the printhead assembly includes one or more firing chambers disposed on a porous substrate. An ink supply is connected to the substrate so that ink is allowed to flow through the pores of the substrate from the ink supply to the firing chamber. Thus, a substantial amount of the energy created by the impact of ink collapsing back into the firing chamber is expended within the pores of the substrate. In another embodiment, one or more firing resistors are formed in each firing chamber, and disposed adjacent the periphery of the firing chamber out of the direct impact path of collapsing ink.