Patents by Inventor Jonathan D. Servaites

Jonathan D. Servaites 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).

  • Bubble valve and bubble valve-based pressure regulator
    Patent number: 6062681
    Abstract: A bubble valve that comprises a liquid delivery channel and a localized heating arrangement. The liquid delivery channel includes an upstream portion and a constriction downstream of the upstream portion. The constriction has a smaller cross-sectional area than the upstream portion. The localized heating arrangement is located in the liquid delivery channel and generates heat to nucleate and enlarge a bubble in the liquid. The constriction is shaped to form a seal with the bubble. The localized heating arrangement additionally generates heat to move the bubble relative to the constriction to control the flow of the liquid. A pressure regulator that comprises a liquid delivery channel connected to a liquid outlet, a sensor located adjacent the liquid outlet, a controller that operates in response to the sensor and a localized heating arrangement. The liquid delivery channel includes an upstream portion, and a constriction located between the upstream portion and the liquid outlet.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: May 16, 2000
    Assignee: Hewlett-Packard Company
    Inventors: Leslie A. Field, Stefano Schiaffino, Phillip W. Barth, Storrs T. Hoen, Naoto A. Kawamura, David K. Donald, Channing R. Robertson, Jonathan D. Servaites