Patents by Inventor Roderick L. Cramer

Roderick L. Cramer 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).

  • Dulcimer construction
    Patent number: 4388852
    Abstract: A dulcimer constructed primarily of wood, wherein the traditional heavy internal wood bracing structure, which is parallel to, and resists the compressive force of, the tuned strings and is connected to the back panel, is replaced by light metallic bracing, of tubular or other suitably engineered cross-section, which is also parallel to, and resists the compressive force of, the tuned strings, but is not in contact with the back panel.
    Type: Grant
    Filed: August 13, 1981
    Date of Patent: June 21, 1983
    Inventor: Roderick L. Cramer