Patents by Inventor Jacob M. Lum

Jacob M. Lum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Recirculation bypass
    Patent number: 12023937
    Abstract: A fluid ejection die may include a fluid actuator, a substrate supporting the fluid actuator, a chamber layer supported by the substrate and a bypass passage in the substrate. The substrate may include a closed inlet channel having an inlet opening for connection to an outlet of a fluid source and an outlet channel having an outlet opening of a first size for connection to an inlet of the fluid source. The chamber layer includes a recirculation passage to supply fluid for ejection by the fluid actuator through an ejection orifice and to circulate fluid across the fluid actuator from the closed inlet channel to the outlet channel. The bypass passage is of a second size less than the first size and connects the inlet channel to the inlet of the fluid source while bypassing any fluid actuator provided for ejecting fluid through an ejection orifice.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: July 2, 2024
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Jacob M. Lum, Si-lam J. Choy, Jeffrey R. Pollard, Tsuyoshi Yamashita, Jeremy Sells, Garrett E. Clark
  • RECIRCULATION BYPASS
    Publication number: 20230103786
    Abstract: A fluid ejection die may include a fluid actuator, a substrate supporting the fluid actuator, a chamber layer supported by the substrate and a bypass passage in the substrate. The substrate may include a closed inlet channel having an inlet opening for connection to an outlet of a fluid source and an outlet channel having an outlet opening of a first size for connection to an inlet of the fluid source. The chamber layer includes a recirculation passage to supply fluid for ejection by the fluid actuator through an ejection orifice and to circulate fluid across the fluid actuator from the closed inlet channel to the outlet channel. The bypass passage is of a second size less than the first size and connects the inlet channel to the inlet of the fluid source while bypassing any fluid actuator provided for ejecting fluid through an ejection orifice.
    Type: Application
    Filed: March 11, 2020
    Publication date: April 6, 2023
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Jacob M. Lum, Si-lam J. Choy, Jeffrey R. Pollard, Tsuyoshi Yamashita, Jeremy Sells, Garrett E. Clark