Patents by Inventor Ian L. Spain

Ian L. Spain 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).

  • Electrical device made of partially pryolyzed polymer
    Patent number: 4642664
    Abstract: An electrical device is made by partially pyrolyzing polymer material by heating the material to between 500.degree. C. and 800.degree. C. Electrodes are applied to the material at two different locations to define an electrically active element therebetween. Devices made according to the teachings of the disclosure exhibit negative resistance in a portion of their voltage current domain and function as bi-directional electrical switches.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: February 10, 1987
    Assignee: Celanese Corporation
    Inventors: Harris A. Goldberg, Ilmar L. Kalnin, Clyde C. Williams, Ian L. Spain