Patents by Inventor Andrew Listwan

Andrew Listwan 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).

  • Deformable liquid crystal sensing head
    Publication number: 20010035767
    Abstract: The method includes a step of contacting a surface of a sensing material to a surface of a substrate to form a mutual contact area between at least a portion of the surface of the sensing material and at least a portion of the surface of the substrate. The method also includes applying a first test signal to an electrode electrically connected to a component on the substrate. The method further includes illuminating the sensing material. The method also has a step of detecting light that has interacted with the sensing material to determine any changes induced in the sensing material by defects in the substrate manifest by applying the first test signal to the electrode. In an apparatus embodiment, a deformable sensing head is disclosed. The sensing head can be sensitive to voltage and heat changes on the substrate plate under test. In a preferred embodiment, the deformable sensing head has inflatable sensing material. The invention should have particular use in testing liquid crystal display panels.
    Type: Application
    Filed: June 25, 2001
    Publication date: November 1, 2001
    Inventor: Andrew Listwan
  • Method and apparatus for testing an electrically conductive substrate
    Patent number: 6285207
    Abstract: The method includes a step of contacting a surface of a sensing material to a surface of a substrate to form a mutual contact area between at least a portion of the surface of the sensing material and at least a portion of the surface of the substrate. The method also includes applying a first test signal to an electrode electrically connected to a component on the substrate. The method further includes illuminating the sensing material. The method also has a step of detecting light that has interacted with the sensing material to determine any changes induced in the sensing material by defects in the substrate manifest by applying the first test signal to the electrode. In an apparatus embodiment, a deformable sensing head is disclosed. The sensing head can be sensitive to voltage and heat changes on the substrate plate under test. In a preferred embodiment, the deformable sensing head has inflatable sensing material. The invention should have particular use in testing liquid crystal display panels.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: September 4, 2001
    Inventor: Andrew Listwan
  • Method and apparatus for testing an electrically conductive substrate
    Patent number: 5999012
    Abstract: The method includes a step of contacting a surface of a sensing material to a surface of a substrate to form a mutual contact area between at least a portion of the surface of the sensing material and at least a portion of the surface of the substrate. The method also includes applying a first test signal to an electrode electrically connected to a component on the substrate. The method further includes illuminating the sensing material. The method also has a step of detecting light that has interacted with the sensing material to determine any changes induced in the sensing material by defects in the substrate manifest by applying the first test signal to the electrode. In an apparatus embodiment, a deformable sensing head is disclosed. The sensing head can be sensitive to voltage and heat changes on the substrate plate under test. In a preferred embodiment, the deformable sensing head has inflatable sensing material. The invention should have particular use in testing liquid crystal display panels.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: December 7, 1999
    Inventor: Andrew Listwan