Patents by Inventor Larry J. Hoffman

Larry J. Hoffman 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).

  • Cold set phenol-formaldehyde resin
    Patent number: 4311619
    Abstract: A phenol-aldehyde resin useful in such applications as a cold-set binder for cores and molds used in the foundry industry and reactive prepolymers used in reaction injection molding compositions produced by the steps of reacting a phenol and aldehyde in a mole ratio of 1 to 1-2.3 in the presence of catalytic amounts of an organic compound of aluminum, zirconium or titanium.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: January 19, 1982
    Assignee: Aristo Corporation
    Inventors: Charles E. Seeney, John F. Kraemer, Larry J. Hoffman