Patents by Inventor David E. Maddison

David E. Maddison 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).

  • Flashlight
    Patent number: D296477
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: June 28, 1988
    Assignee: Duracell Inc.
    Inventors: David H. Powell, David E. Maddison, Richard W. Seymour, Veronica G. Steel
  • Flashlight
    Patent number: D296478
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: June 28, 1988
    Assignee: Duracell Inc.
    Inventors: David H. Powell, David E. Maddison, Richard W. Seymour, Veronica G. Steel
  • Flashlight
    Patent number: D299173
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: December 27, 1988
    Assignee: Duracell Inc.
    Inventors: David H. Powell, David E. Maddison, Richard W. Seymour, Veronica G. Steel