Patents by Inventor Karl Dondoroff

Karl Dondoroff 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).

  • Rigid polyurethane/polyisocyanurate foams containing paraffinic based oils
    Patent number: 5476681
    Abstract: The invention is a rigid polyurethane foam to which a base stock lubricating oil made of at least 55 weight percent paraffinic carbons and less than 10 weight percent aromatic carbons has been added as a hydrophobic agent protecting the polyurethane foam from reacting with environmental moisture. The foam is useful for deposit in railroad spike holes or any structural member having a cavity and where moisture within or on the cavity would otherwise react with the isocyanate to produce an uncontrollable foaming mass.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: December 19, 1995
    Assignee: BASF Corporation
    Inventors: Agus Sampara, Rob Hutchings, Tom Harris, Karl Dondoroff, Kerry Bowman