Patents by Inventor David Zielski

David Zielski 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: 6122353
    Abstract: A method and apparatus for verifying that a CAS (Customer Premises Equipment Alerting Signal) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid detect signal, includes structure and process steps for suppressing a signal originating at a local telephone in response to the CAS detect signal. A determination is made whether the CAS detect signal remains in a predetermined condition at a predetermined time after the local telephone signal is suppressed. A validity signal is output when the CAS detect signal remains in the predetermined condition at the predetermined time. False detections are thereby minimized by ignoring detections caused by a signal originating at the local telephone.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: September 19, 2000
    Assignee: Cidco Incorporated
    Inventors: Robert H. Brady, David Zielski, William L. Nutter, Alexander J. Marra
  • Patent number: 5649002
    Abstract: A method and apparatus for verifying that a CAS (Customer Premises Equipment Alerting Signal) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid detect signal, includes structure and process steps for suppressing a signal originating at a local telephone in response to the CAS detect signal. A determination is made whether the CAS detect signal remains in a predetermined condition at a predetermined time after the local telephone signal is suppressed. A validity signal is output when the CAS detect signal remains in the predetermined condition at the predetermined time. False detections are thereby minimized by ignoring detections caused by a signal originating at the local telephone.
    Type: Grant
    Filed: December 13, 1994
    Date of Patent: July 15, 1997
    Assignee: Colonial Data Technologies Corp.
    Inventors: Robert H. Brady, David Zielski, William L. Nutter, Alexander J. Marra