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:
Apr. 28, 1998
Filed:
May. 16, 1996
Bruce H Ostermeier, Irvine, CA (US);
Other;
Abstract
An ink jet cartridge comprising an ink chamber, at least one aperture coupling a pressure relief chamber to the ink chamber, the aperture having a small internal diameter for creating a negative pressure on any ink in the lower portion of the ink chamber and a plurality of microparticles positioned in the pressure relief chamber for forming a plurality of small interstices which form a capillary path in the pressure relief chamber, the microparticles creating a negative pressure on any ink in the lower portion of the ink chamber and the selected size of the microparticles resulting in a capillary path of selected size for controlling the magnitude of the negative pressure in the lower portion of the ink chamber. The pressure relief chamber is positioned below the ink chamber, the ink chamber including an opening to couple the ink cartridge to an ink jet head and the aperture is positioned at the lower portion of the ink chamber.