Patents by Inventor Robert S. Rettke

Robert S. Rettke 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: 5620324
    Abstract: An educational kit for instilling in children a positive self-image at an early age. The kit (known as "ALPHA BLOCKS") teaches young children the complete alphabet and numeral system in a way that is fun, captivating, hands-on and helps them acquire understanding of divergent shapes and colors. The kit includes alphanumeric symbols ranging from the letters of the alphabet to numerals 0 to 9. The symbols are separable into dual sections via a dovetail and groove connection. The dovetail and groove connection ensures a strong and study attachment that permits easy separation of the symbols by the children. Each symbol has a unique color that helps distinguish it from the other symbols. This assists the children in assembling the symbols and also helps them develop the ability to distinguish colors. Included also in the kit is a receptacle useful in storing the complete set of alphanumeric symbols and displays each individual symbol (with its appropriate color) in both an attached and detached arrangement.
    Type: Grant
    Filed: November 16, 1995
    Date of Patent: April 15, 1997
    Inventor: Robert S. Rettke