Patents by Inventor Raymond A. Spanner

Raymond A. Spanner 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).

  • Electrochromic display employing potentiostatic erasure
    Patent number: 4649382
    Abstract: Completion of potentiostatic erasure of an electrochromic display is detected by monitoring the erase current supplied to addressed display electrodes by potentiostatic erase drive means. The occurrence of a fall in erase current, corresponding to completion of the erasure of the addressed display electrodes, is detected, preferably by a threshold detector, and an erase completion indication produced. This indication effects disconnection of the erase current path.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: March 10, 1987
    Assignee: International Business Machines Corporation
    Inventors: David H. Martin, Raymond A. Spanner