Patents by Inventor David J. Hillman

David J. Hillman 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).

  • Absolute pressure sensor
    Patent number: 6647794
    Abstract: A barometric pressure sensor including a base layer, a sensor layer and a reference layer. The base layer has a passageway between a pressure inlet and a mounting face. The sensor layer is bonded by an insulating bond to the mounting face and includes a conductive diaphragm. The reference layer is mounted on the sensor layer to form a reference vacuum cavity. The reference layer includes a conducting surface facing the conductive diaphragm across the reference vacuum cavity to form a pressure sensing capacitor.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: November 18, 2003
    Assignee: Rosemount Inc.
    Inventors: Daniel S. Nelson, David J. Hillman, John McIntire
  • ABSOLUTE PRESSURE SENSOR
    Publication number: 20030205089
    Abstract: A barometric pressure sensor including a base layer, a sensor layer and a reference layer. The base layer has a passageway between a pressure inlet and a mounting face. The sensor layer is bonded by an insulating bond to the mounting face and includes a conductive diaphragm. The reference layer is mounted on the sensor layer to form a reference vacuum cavity. The reference layer includes a conducting surface facing the conductive diaphragm across the reference vacuum cavity to form a pressure sensing capacitor.
    Type: Application
    Filed: May 6, 2002
    Publication date: November 6, 2003
    Inventors: Daniel S. Nelson, David J. Hillman, John McIntire