Patents by Inventor David E. Ramsey, Jr.

David E. Ramsey, Jr. 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).

  • Production of SiC whiskers
    Patent number: 4283375
    Abstract: Silicon carbide whiskers useful for reinforcement of metals are manufactured from SiO.sub.2 and carbon. Rice hulls are ashed in air at approximately 620.degree. C. to obtain amorphous SiO.sub.2, which is then blended with fine particle size carbon. The mixture is rapidly heated under CO atmosphere to 1500.degree. C., and when the temperature reaches that point the CO atmosphere is flushed with argon, the SiC whiskers forming in the argon atmosphere. The product is purified by ashing in air to remove excess carbon and/or washed with HF to remove unreacted SiO.sub.2.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: August 11, 1981
    Assignee: Great Lakes Carbon Corporation
    Inventors: Ottis J. Horne, Jr., David E. Ramsey, Jr.
  • Production of SiC from rice hulls and silica
    Patent number: 4248844
    Abstract: SiC whiskers are made by separating a quantity of rice hulls into two portions, carbonizing one portion in a non-oxidizing atmosphere, ashing the other portion in air, combining the carbonized residue and amorphous SiO.sub.2 obtained, and heating in a noble gas atmosphere.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: February 3, 1981
    Assignee: Great Lakes Carbon Corporation
    Inventors: David E. Ramsey, Jr., Lloyd I. Grindstaff