Patents by Inventor Ralph D. Castillo

Ralph D. Castillo 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).

  • Hair cutting guide
    Patent number: 4137925
    Abstract: A hair cutting guide to aid a hair stylist in the uniform cutting of hair on a head. The guide providing a pattern for quickly cutting the hair to a particular hair style and using the guide over again for cutting the same hair style at the same length or the guide may be adjusted for cutting a new hair style at a different length.
    Type: Grant
    Filed: August 8, 1977
    Date of Patent: February 6, 1979
    Inventor: Ralph D. Castillo