Patents by Inventor Donald W. Sherwood

Donald W. Sherwood 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).

  • Foundry aggregate binders and foundry compositions prepared therefrom
    Patent number: 4311620
    Abstract: Novel resin binders for foundry sand molds and cores are provided by reacting a polyol component comprising a phenol ketone resin, a reactive solvent and a cross-linking agent in a solution for these components with a solution of an organic polyisocyanate. The foundry binder cures rapidly at ambient temperature in the presence of a tertiary amine curing agent to provide strong foundry molds and cores. Polyether polyols may also be incorporated in the polyol component of the novel resin binder.
    Type: Grant
    Filed: May 8, 1980
    Date of Patent: January 19, 1982
    Assignee: Hooker Chemicals & Plastics Corp.
    Inventors: Donald W. Sherwood, Daniel T. Riordan