Patents by Inventor Richard L. Pelfrey

Richard L. Pelfrey 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).

  • Composite core assembly for metal casting
    Patent number: 4922991
    Abstract: Disclosed is a method for making metal castings wherein a composite core assembly is utilized. The composite core assembly comprises at least one casting core and one temporary core which are in intimate contact wherein the temporary core is removed prior to casting. The improvement of the present invention comprises forming the temporary core comprising an aggregate and binder of materials such that the temporary core is sufficiently soluble in aqueous solvent for its removal prior to metal casting. The casting core is not removed by the aqueous solvent.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: May 8, 1990
    Assignee: Ashland Oil, Inc.
    Inventors: Michael A. Pitcher, Albert L. Haugse, Richard L. Pelfrey, Gregory P. Sturtz
  • Flower pot and method for making
    Patent number: 4193909
    Abstract: Disclosed is a resin-aggregate mixture comprising polyurethane resin, aggregate (sand), silane compounds, iron oxide and powdered thermoplastic resins. Flower pots from this composition are cured either with a tertiary amine, base, or metallic ion. The cured pots subsequently are baked at a temperature sufficient to fuse the thermoplastic resin to provide a pot having air permeability but resistance to the permeation of water.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: March 18, 1980
    Assignee: Ashland Oil, Inc.
    Inventors: John A. Lundberg, Robert J. Schafer, Richard H. Toeniskoetter, Richard L. Pelfrey