Patents by Inventor Randy C. Schaffer

Randy C. Schaffer 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: 6402830
    Abstract: The invention is a lightweight, economical and durable concrete which is easily manufactured from commonly available materials, and its method of manufacture. The concrete composition comprises cement, perlite, pumice and water. The cement is common Portland cement. The perlite is an expanded perlite available. Preferably, the perlite is {fraction (3/16)}″ minus to dust in size. The pumice is common pumice aggregate. Preferably, the pumice is ¾″ minus to dust in size. Additional, optional, conventional components for adhesiveness, color, texture, hardening and drying time may also be added.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: June 11, 2002
    Inventor: Randy C. Schaffer