Printing fluid circulation

US11807019B2 · kind B2 · utility

Assignee

• HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. · US

Inventors

• Ronald A. Askeland · San Diego, US
• Blair A. Butler · San Diego, US
• Ronald J. Ender · Corvallis, US
• Craig L. Malik · Corvallis, US
• Daniel D. Dowell · Albany, US
• Seth Haddix · Corvallis, US
• Si-lam Choy · Corvallis, US
• Alexander Govyadinov · Corvallis, US

Key dates

• Filing date: Jul 31, 2019
• Grant date: Nov 7, 2023
• Expiry date: Aug 25, 2039

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41J2202/12
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

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.