Patents by Inventor Ralph Dunn

Ralph Dunn 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).

  • Method of making miniature doll heads
    Patent number: 4450129
    Abstract: A process is disclosed for making miniature doll heads. An oversized head is formed of a shrinkable plastisol including a plasticizer, and facial features are applied to the head using a shrinkable paint. Hair is rooted to the scalp of the oversized head. The head is reduced in size by extracting the plasticizer from the plastisol. During the extraction, the head and its facial features shrink simultaneously to form the miniature head.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: May 22, 1984
    Assignee: Mattel, Inc.
    Inventors: Ralph Dunn, Leonard R. Coleman
  • Changeable-shape hair piece and method of styling an artificial coiffure
    Patent number: 3955587
    Abstract: Ductile filaments, such as 37-43 gauge plastic coated metal wire, are distributed throughout hair filaments in such a manner that a small number of ductile filaments may be used to hold a large number of hair filaments in a changeable-shape coiffure. The ductile filaments may be distributed throughout any body of living hair or hair which is attached to a base member.
    Type: Grant
    Filed: September 28, 1972
    Date of Patent: May 11, 1976
    Assignee: Mattel, Inc.
    Inventors: Ralph Dunn, J. Stephen Lewis, Mellie M. Phillips