Patents by Inventor David J Clift

David J Clift 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).

  • Communications system with direct access mailbox
    Patent number: 7756258
    Abstract: A communication system (1) in which a user (A) can elect to leave a message directly in the mailbox (11a) of another user (B) without calling or disturbing user (B). A store (database 7) is generated and maintained which identifies those users who are allowed direct access to the mailbox of user (B). The store is automatically updated whenever user (B) sends a communication to other users.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: July 13, 2010
    Assignee: British Telecommunications plc
    Inventors: David J Clift, John G Johnston, Robert M Claxton, David J Borthwick