Patents by Inventor William Duane Derfler

William Duane Derfler 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).

  • Patent number: 4099271
    Abstract: A lightweight costume head having a hollow foundation constructed from thin slabs of foamed, elastomeric sections adhered together having an access opening and generally a cloth covering enveloping said foundation is described. The foundation generally has eye openings and may have a nose-mouth opening. The foundation comprises at least five sections cut from the flat slab of a foamed elastomer to form a head shape, frequently a spherical shape from identical sections adhered along their edges.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: July 11, 1978
    Inventors: Terry Mark Allen, William Duane Derfler