Patents by Inventor Douglas Andrejewski

Douglas Andrejewski 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).

  • Roll crusher to produce high purity polycrystalline silicon chips
    Patent number: 7270706
    Abstract: A single roll crusher for comminuting high purity materials includes a roll with teeth spaced around the circumference of the roll. The roll is rotatably mounted inside a housing. The housing has a top with an entrance port, sides, and bottom with an exit port. The roll, teeth, and at least the inside surfaces of the top, sides, and bottom are fabricated from a material of construction that minimizes contamination of silicon. The material of construction may be tungsten carbide with a cobalt binder. The single roll crusher is used for processing polycrystalline silicon.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: September 18, 2007
    Assignee: Dow Corning Corporation
    Inventors: Douglas Andrejewski, Thomas Dubay, Terence Lee Horstman, Roger Dale Spencer, Jr.
  • Roll crusher to produce high purity polycrystalline silicon chips
    Publication number: 20060070569
    Abstract: A single roll crusher for comminuting high purity materials includes a roll with teeth spaced around the circumference of the roll. The roll is rotatably mounted inside a housing. The housing has a top with an entrance port, sides, and bottom with an exit port. The roll, teeth, and at least the inside surfaces of the top, sides, and bottom are fabricated from a material of construction that minimizes contamination of silicon. The material of construction may be tungsten carbide with a cobalt binder. The single roll crusher is used for processing polycrystalline silicon.
    Type: Application
    Filed: September 20, 2005
    Publication date: April 6, 2006
    Inventors: Douglas Andrejewski, Thomas Dubay, Terence Horstman, Roger Spencer