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:
Jun. 10, 1997
Filed:
Oct. 06, 1994
Brian J Keefe, La Jolla, CA (US);
May F Ho, La Mesa, CA (US);
Kenneth J Courian, San Diego, CA (US);
Steven W Steinfield, San Diego, CA (US);
Winthrop D Childers, San Diego, CA (US);
Ellen R Tappon, Corvallis, OR (US);
Kenneth E Trueba, Corvallis, OR (US);
Terri I Chapman, Escondido, CA (US);
William R Knight, Corvallis, OR (US);
Jules G Moritz, III, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
Described is an inkjet print cartridge including an ink reservoir; a substrate having a plurality of individual ink firing chambers with an ink firing element in each chamber; said ink firing chambers arranged in a first chamber array and a second chamber array and said firing chambers spaced so as to provide 600 dots per inch printing; an ink channel connecting said reservoir with said ink firing chambers, said channel including a primary channel connected at a first end with said reservoir and at a second end to a secondary channel; a separate inlet passage for each firing chamber connecting said secondary channel with said firing chamber for allowing high frequency refill of the firing chamber; a group of said firing chambers in adjacent relationship forming a primitive in which only one firing chamber in said primitive is activated at a time; a first circuit on said substrate connected to said firing elements; and a second circuit on said cartridge connected to said first circuit, for transmitting firing signals to said ink firing elements at a predetermined frequency. The preferred configuration of the nozzle member, ink channels, and firing chambers allows a printing resolution of 600 dots per inch.