Patents by Inventor Donald W. Birtell

Donald W. Birtell 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).

  • Process for producing silicon carbide whiskers
    Patent number: 4789536
    Abstract: A method of manufacturing silicon carbide whiskers in which silicon and carbon containing feedstock is placed on a series of gas permeable supports and passed through a reaction zone. The feedstock is maintained at 1500.degree. C. to 1700.degree. C. between forty to eighty minutes while the off gases from other reacting feedstock is permitted to pass from one support to another. In this manner uniformity of environment is maintained to produce high quality silicon carbide whiskers having average diameters by mass between 1 and 1.5 microns.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: December 6, 1988
    Assignee: J. M. Huber Corporation
    Inventors: Dale E. Schramm, Donald W. Birtell