Patents by Inventor James H. Hammar

James H. Hammar 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).

  • Patent number: 5851041
    Abstract: An improved wafer holder with spindle assembly and wafer holder actuator is disclosed. In one embodiment, the vertical motion of a shaft drives an arm positioning member in a rotational motion. The arm positioning member is coupled to a first position of an arm such that the arm moves in a horizontal motion when the arm positioning member rotates. A substrate holding member is coupled to the arm at a second position, such that the horizontal motion of the arm moves the substrate holding member between an open and a closed position. The shaft of the above described embodiment is moved in a vertical motion by an actuator. A first cylinder of the actuator expands and engages a spring which moves the shaft upward and a second cylinder of the actuator retracts to disengage the first cylinder thereby moving the shaft downward.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: December 22, 1998
    Assignee: OnTrak Systems, Inc.
    Inventors: Donald E. Anderson, James H. Hammar