Patents by Inventor William Robert Ullrich

William Robert Ullrich 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: 6006826
    Abstract: An ice rink installation having polymer plastic heat transfer piping imbedded in a substrate, such as concrete. The polymer plastic heat transfer piping extends throughout an ice rink and includes a tubular body having an exterior surface and an interior surface. The tubular body has a wall thickness of less than 8.5% of its inner diameter. In order for the tubular body to remain sufficiently robust with such thin walls, a plurality of vanes are positioned on either the exterior surface, the interior surface or on both surfaces.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: December 28, 1999
    Inventors: Ralph Spencer Goddard, Bradley John Spencer Goddard, William Robert Ullrich