Patents by Inventor David J. Prepelka

David J. Prepelka 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).

  • Elastomer polyurethane-polyurea coatings based on bis(4-isocyanatocyclohexyl)methane
    Patent number: 4581433
    Abstract: The present invention relates to coating compositions comprising (i) an isocyanate prepolymer based on bis(4-isocyanatocyclohexyl)methane and polyalkylene ether polyols having hydroxyl functionalities of 2 to 3 and (ii) at least one diprimary aromatic diamine having at least one alkyl substituent in an ortho-position to one amino group and two alkyl substituents in both ortho-positions to the other amino group.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: April 8, 1986
    Assignee: Mobay Corporation
    Inventors: Terry A. Potter, Peter H. Markusch, David J. Prepelka