Patents by Inventor Yahua Li

Yahua Li 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).

  • Direct acting vacuum control ink system
    Patent number: 8794725
    Abstract: A piezoelectric DOD printing system including a piezoelectric-based print engine, a micro pump, an ink line, a vacuum sensor, and control circuitry. The micro pump delivers ink from a cartridge reservoir to the print engine. The ink line fluidly connects an outlet of the micro pump with an inlet of the print engine. The vacuum sensor is fluidly connected to the ink line. The control circuitry is electrically coupled to the vacuum sensor and programmed to control operation of the print engine and the micro pump. The control circuitry activates and deactivates the micro pump based upon information from the vacuum sensor.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: August 5, 2014
    Assignee: Engage Technologies Corp.
    Inventors: Cris R. Miller, John E. Bateson, Yahua Li