Patents by Inventor Albert E. Ritter

Albert E. Ritter 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 for molding expanded plastic material articles
    Patent number: 4260571
    Abstract: According to the method of the invention an article of thermoplastic material is partially expanded and preformed in a heated mold. The preformed article is withdrawn from the heated mold to further expand at atmospheric pressure and is transferred still malleable into a cooled mold having the final size and configuration of the article.
    Type: Grant
    Filed: April 11, 1978
    Date of Patent: April 7, 1981
    Assignee: Selene Trust
    Inventor: Albert E. Ritter