Patents by Inventor Daniel R. Marron

Daniel R. Marron 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).

  • Small particle plasma spray apparatus, method and coated article
    Patent number: 5858470
    Abstract: A method of coating a surface using a plasma arc torch comprises directing a plasma plume externally from a discharge end of the plasma torch toward the surface, positioning a powder injector proximate the plasma plume to introduce ceramic oxide powder particles at a size less than 20 microns diameter into an outer mantle of the plasma plume so that the powder particles are confined in the outer mantle, directing first and second gas jets at the plasma plume downstream of the powder injector position and on opposite sides of the plasma plume to enhance entrainment of the injected powder particles in the outer mantle, circulating the powder particles in the outer mantle of the plasma plume for a residence time to heat the powder particles to melt them without substantial vaporization, and depositing the melted powder on the surface as a dense coating having closed porosity.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: January 12, 1999
    Assignee: Northwestern University
    Inventors: Thomas F. Bernecki, Daniel R. Marron
  • Small particle plasma spray apparatus, method and coated article
    Patent number: 5744777
    Abstract: A method of coating a surface using a plasma arc torch comprises directing a plasma plume externally from a discharge end of the plasma torch toward the surface, positioning a powder injector proximate the plasma plume to introduce ceramic oxide powder particles at a size less than 20 microns diameter into an outer mantle of the plasma plume so that the powder particles are confined in the outer mantle, directing first and second gas jets at the plasma plume downstream of the powder injector position and on opposite sides of the plasma plume to enhance entrainment of the injected powder particles in the outer mantle, circulating the powder particles in the outer mantle of the plasma plume for a residence time to heat the powder particles to melt them without substantial vaporization, and depositing the melted powder on the surface as a dense coating having closed porosity.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: April 28, 1998
    Assignee: Northwestern University
    Inventors: Thomas F. Bernecki, Daniel R. Marron