Patents by Inventor David Michael Brewster

David Michael Brewster 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).

  • Extension phone off-hook check for Type 2 Caller ID reception in a telephone adjunct device
    Patent number: 6697471
    Abstract: A system and method for detecting a condition of an extension telephone is presented for processing caller ID information. A reference value of a telephone line connected to an apparatus is first determined. An auxiliary telephone connected to the apparatus is then disconnected. A second value of the telephone line is determined while the auxiliary telephone is disconnected. The reference value and the second value of the telephone line are compared to determine the condition, such as off-hook, of the extension telephone.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: February 24, 2004
    Assignee: Thomson Licensing S.A.
    Inventors: Watson Yuet Lai Chan, Sowjanya Reddy Pandipati, David Michael Brewster, John Justin Caffrey