Patents by Inventor David Dubbs

David Dubbs 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).

  • Adjunct answering machine
    Patent number: D319439
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: August 27, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: David C. Danielson, David Dubbs, Daniel K. Harden, Raymond Motluck, Michael P. Zambelli
  • Integrated answering machine
    Patent number: D320985
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: October 22, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: David C. Danielson, David Dubbs, Daniel K. Harden, Raymond Motluck, Michael P. Zambelli