Patents by Inventor Richard H. Smoak

Richard H. Smoak 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).

  • Patent number: 4237085
    Abstract: A method of pressureless sintering silicon carbide mixtures to obtain a sintered, dense product when the silicon carbide starting materials do not include a densification aid, such as boron, beryllium or aluminum, is described. The starting materials are mixtures containing predominantly particulate silicon carbide and include usually less than about 10 and, preferably, less than about 6 percent by weight of carbon in the form of elemental carbon or in the form of a carbon source material. The mixtures may also contain minor amounts of other additives, such as lubricants, surfactants or agglutinants, to aid in forming a compact, or green body, from the mixtures, or minor amounts of other ceramic materials depending upon the nature of the desired final product. The mixtures are formed into compacts, or green bodies, by known techniques.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: December 2, 1980
    Assignee: The Carborundum Company
    Inventor: Richard H. Smoak
  • Patent number: 4172109
    Abstract: A sinterable silicon carbide mixture is described which is prepared by mixing finely-divided silicon carbide containing between about 0.5 and about 5.0 percent by weight of excess carbon with a finely-divided beryllium-containing additive wherein the amount of beryllium in the mixture is equal to between about 0.03 and about 1.5 percent by weight of the powder. A dense silicon carbide ceramic product is prepared from the powder mixture by pressureless sintering wherein the article is initially shaped and subsequently sintered in a beryllium-containing atmosphere at a temperature from about 1950.degree. to about 2300.degree. C.
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: October 23, 1979
    Assignee: The Carborundum Company
    Inventor: Richard H. Smoak
  • Patent number: 4080415
    Abstract: Disclosure is made of a high-density, high-strength silicon carbide ceramic material that is produced using a silicon carbide powder containing boron or boron-containing compound as a densification additive by the utilization of boron in the sintering atmosphere.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: March 21, 1978
    Assignee: The Carborundum Company
    Inventors: John A. Coppola, Richard H. Smoak
  • Patent number: RE30286
    Abstract: Disclosure is made of a high-density, high-strength silicon carbide ceramic material that is produced using a silicon carbide powder containing boron or boron-containing compound as a densification additive by the utilization of boron in the sintering atmosphere.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: May 27, 1980
    Assignee: The Carborundum Company
    Inventors: John A. Coppola, Richard H. Smoak