Patents by Inventor Frank Edward Critchfield

Frank Edward Critchfield 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).

  • Phenolic foam modified with phosphorus-containing isocyanate-terminated prepolymers
    Patent number: 4119584
    Abstract: This invention provides a low density (<2 pcf.) modified phenolic foam produced by combining a resole resin with a phosphorus-containing isocyanate-terminated prepolymer in the presence of a minor amount of a surfactant, a catalytic amount of an organotin catalyst, and a halocarbon blowing agent. Foam products producted by the method of the invention have a good combination of low combustibility, friability resistance and compressive strength.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: October 10, 1978
    Assignee: Union Carbide Corporation
    Inventors: Anthony Joseph Papa, Richard Lee Rollins, Frank Edward Critchfield
  • Process for preparing particulate polyurethane polymers and the polymers derived therefrom
    Patent number: 4000218
    Abstract: Particulate thermoplastic polyurethane polymers are produced in inert organic non-solvent for the polymer by polymerization of diisocyanate, dihydroxy polymer and chain extender in the presence of an organic polymeric interfacial agent. The agent can be a block copolymer of C.sub.6 -C.sub.30 alkyl alkenoate and vinyl halide, a block copolymer of the alkenoate and a polyoxyalkylene glycol, a block copolymer of the alkenoate and a cyclic ester such as caprolactone, or a graft copolymer of the alkenoate, vinyl monomer with hydroxyl or amino group such as an hydroxyalkyl acrylate or an amino alkyl acrylate, and a cyclic ester.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: December 28, 1976
    Assignee: Union Carbide Corporation
    Inventors: Frank Edward Critchfield, Frank Paul Del Giudice, Richard Michael Gerkin