Patents by Inventor Stephen G. Sitko

Stephen G. Sitko 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 and apparatus for applying coatings using a nozzle assembly having passageways of differing diameter
    Patent number: 5858469
    Abstract: Known thermal spray apparatus are modified to achieve thermal spray coatings of increased hardness. Thermal spray apparatus operate to develop a plasma stream for introduction to a nozzle, for eventual application to the surface of a substrate. Upon entering the nozzle, the plasma stream is passed through a plasma cooling zone defined by a plasma cooling passageway, to a plasma accelerating zone defined by a narrowed passageway that expands into a plasma/particle confining zone for the discharge of material from the apparatus. The narrowed passageway of the apparatus is cooled, and the powder material to be applied by the apparatus is introduced into the plasma stream along the cooled, narrowed passageway.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: January 12, 1999
    Assignee: Sermatech International, Inc.
    Inventors: Purusottam Sahoo, Stephen G. Sitko