Patents by Inventor Harold E. Debolt

Harold E. Debolt 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).

  • Method of applying a carbon-rich surface layer to a silicon carbide filament
    Patent number: 4415609
    Abstract: The invention relates to a surface treatment for stoichiometric silicon carbide. A carbon-rich silicon carbide layer is applied over the silicon carbide. In the case of the silicon carbide surface, the ratio of silicon to carbon in the carbon-rich layer varies from one at the silicon carbide interface to near zero in the interior of the carbon-rich layer to greater than zero and preferably 0.3 to 0.5 on the surface of the carbon-rich layer remote from the interface. A preferred method of making the silicon carbide layer is also presented.
    Type: Grant
    Filed: May 5, 1982
    Date of Patent: November 15, 1983
    Assignee: Avco Corporation
    Inventors: Harold E. Debolt, Raymond J. Suplinskas, James A. Cornie, Thomas W. Henze, Albert W. Hauze
  • Process control system
    Patent number: 4358473
    Abstract: This invention relates to a process control system and method of controlling a chemical vapor deposition (CVD) process where a coating is deposited on a substrate heated by passing a current through the substrate to create a heating zone. The control system relies on detecting a signal induced on the coated substrate outside of the heating zone and using the induced signal to control one or more process parameters.
    Type: Grant
    Filed: May 22, 1981
    Date of Patent: November 9, 1982
    Assignee: Avco Corporation
    Inventors: Harold E. DeBolt, Joseph Morrissey, Raymond J. Suplinskas
  • Coated stoichiometric silicon carbide
    Patent number: 4340636
    Abstract: The invention relates to a surface treatment for stoichiometric silicon carbide. A carbon-rich silicon carbide layer is applied over the silicon carbide. In the case of the silicon carbide surface, the ratio of silicon to carbon in the carbon-rich layer varies from one at the silicon carbide interface to near zero in the interior of the carbon-rich layer to greater than zero and preferably 0.3 to 0.5 on the surface of the carbon-rich layer remote from the interface. A preferred method of making the silicon carbide layer is also presented.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: July 20, 1982
    Assignee: Avco Corporation
    Inventors: Harold E. DeBolt, Raymond J. Suplinskas, James A. Cornie, Thomas W. Henze, Albert W. Hauze
  • Carbon filament coated with boron and method of making same
    Patent number: 4142008
    Abstract: The invention is directed to a method of making a high strength-high modulus boron filament on a carbon substrate which is coated with pyrolytic graphite. Boron is deposited over the pyrolytic graphite. A preferred method of making such a filament citing specific pyrolytic graphite deposition temperatures is described.
    Type: Grant
    Filed: June 27, 1977
    Date of Patent: February 27, 1979
    Assignee: Avco Corporation
    Inventor: Harold E. DeBolt
  • Silicon carbide filaments and method
    Patent number: 4127659
    Abstract: A refractory substrate, which generally is graphite or carbon is overcoated with silicon carbide by chemical vapor deposition from gaseous sources of silicon and carbon. The deposition generally takes place in combination with hydrogen and the coating on the substrate generally has a thickness at least equal to the diameter of the substrate itself. A silicon carbide filament containing an inner and outer surface layer of carbon rich silicon carbide, together with a method of making the same, is described.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: November 28, 1978
    Assignee: Avco Corporation
    Inventors: Harold E. DeBolt, Thomas W. Henze
  • Filamentary reinforcement product
    Patent number: 4123583
    Abstract: A filamentary reinforcement product for composites used in applications requiring high strength and high modulus of elasticity materials, particularly under high temperature service conditions, comprises one mil thick or thicker coatings of boron or boron carbide on a substrate which comprises about a one mil diameter carbon substrate having a catalytically transformed skin layer of highly oriented graphite formed from the carbon substrate using a boron catalyst.
    Type: Grant
    Filed: May 23, 1977
    Date of Patent: October 31, 1978
    Assignee: Avco Corporation
    Inventor: Harold E. DeBolt
  • Silicon carbide filaments and method
    Patent number: 4068037
    Abstract: A refractory substrate, which generally is graphite or carbon is overcoated with silicon carbide by chemical vapor deposition from gaseous sources of silicon and carbon. The deposition generally takes place in combination with hydrogen and the coating on the substrate generally has a thickness at least equal to the diameter of the substrate itself. A silicon carbide filament containing an inner and outer surface layer of carbon rich silicon carbide, together with a method of making the same, is described.
    Type: Grant
    Filed: January 2, 1976
    Date of Patent: January 10, 1978
    Assignee: Avco Corporation
    Inventors: Harold E. Debolt, Thomas W. Henze
  • Process for modifying amorphous carbon filaments
    Patent number: 4045597
    Abstract: A filamentary reinforcement product for composites used in applications requiring high strength and high modulus of elasticity materials, particularly under high temperature service conditions, comprising one mil thick or thicker coatings of boron or boron carbide on a substrate which comprises about a one mil diameter carbon substrate having a catalytically transformed skin layer of highly oriented graphite formed from the carbon substrate using a boron catalyst.
    Type: Grant
    Filed: November 24, 1975
    Date of Patent: August 30, 1977
    Assignee: Avco Corporation
    Inventor: Harold E. Debolt