Patents by Inventor Michael T. Mathews

Michael T. Mathews 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).

  • Method and structure for detecting a customer premises equipment alerting signal
    Patent number: 5862212
    Abstract: A method and device for detecting a customer premises equipment alerting signal (CAS) tone in a telephone system which has both caller identification and call waiting. The present invention distinguishes between valid CAS tones transmitted by the telephone company central office and invalid CAS tones which are caused by music or a human voice. The present invention samples detected tone during a plurality of sample periods. The change of frequency, as well as the direction of frequency change, between successive sample periods is calculated. The number of transitions in the direction of frequency change are counted and used to determine whether the detected tone corresponds to a valid CAS tone or an invalid CAS tone.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: January 19, 1999
    Assignee: CIDCO Incorporated
    Inventor: Michael T. Mathews
  • Contoured belt clip for folding knife
    Patent number: D487628
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: March 23, 2004
    Assignee: Utica Cutlery Company
    Inventor: Michael T. Mathews