Patents by Inventor David Charles Drum

David Charles Drum 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).

  • Posture training device
    Patent number: 4007733
    Abstract: A posture training device having adjustable shoulder straps connected to opposite points on a waistband of clothing of a user and including signalling means to apply a sensory stimulus to the user and means to detect the relaxation of tension in the strap.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: February 15, 1977
    Assignee: Vaxar Ltd.
    Inventors: Victor Celeste, David Charles Drum, Brian Joseph Nelson