Patents by Inventor Richard P. Bergmann

Richard P. Bergmann 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).

  • Two-tube continuous sand muller
    Patent number: 4322168
    Abstract: A continuous sand muller for mixing foundry sand and binder additives includes a premixing tube and a primary mixing tube removably secured to a frame. The premixing tube includes a mixing auger and mixes sand and a catalyst. The primary mixing tube receives the mix from the premixing tube. A resin additive or other binder is fed to the primary mixing tube. A single, double shafted motor drives the primary mixing auger directly and the premixing auger through a timing belt drive. The mixed sand and binder is delivered by the primary mixing tube to an outlet. An access or cleanout cover is removably secured to the primary mixing tube.
    Type: Grant
    Filed: April 25, 1980
    Date of Patent: March 30, 1982
    Assignee: Carver Foundry Products
    Inventors: Rodney L. Hartung, Dennis L. McCann, Larry W. Uhre, Richard P. Bergmann, James A. Hostetter, Nicholas J. Konrad