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:
Feb. 13, 2001
Filed:
Jan. 12, 1999
Applicant:
Inventor:
Jeffrey K. Pew, Lake Oswego, OR (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/175 ;
U.S. Cl.
CPC ...
B41J 2/175 ;
Abstract
An ink supply is contained in a manner that combines foam and free ink storage to provide high volumetric efficiency, back pressure regulation to protect against ink leakage, and a generally lower cost, easy-to-manufacture assembly. Ink leakage protection is present despite exposure of the supply to substantial variations in temperature and ambient air pressure. The container is divided, and part of the container includes porous material for storing ink. Capillary pressures of the material and of a bubble generator in the free-ink part of the container are selected to control the sequence with which ink is removed from the container parts.