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:
Nov. 07, 2023
Filed:
Jul. 31, 2019
Hewlett-packard Development Company, L.p., Spring, TX (US);
Ronald Albert Askeland, San Diego, CA (US);
Blair A. Butler, San Diego, CA (US);
Ronald J. Ender, Corvallis, OR (US);
Craig L. Malik, Corvallis, OR (US);
Daniel D. Dowell, Corvallis, OR (US);
Seth Stephen Haddix, Corvallis, OR (US);
Si-Lam J. Choy, Corvallis, OR (US);
Alexander Govyadinov, Corvallis, OR (US);
Hewlett-Packard Development Company, L.P., Spring, TX (US);
Abstract
A printing fluid pen includes a plurality of fluid ports, a pressure regulator in fluid communication with a first fluid port, and a valve in fluid communication with a second fluid port. The first fluid port is to deliver printing fluid to a fluid ejection device, and the second fluid port is to direct printing fluid out of the pen. In response to negative pressure, the valve is to open to enable fluids within the pen to exit via the second port.