Patents by Inventor Douglas R. Dowell

Douglas R. Dowell 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).

  • High build polyurethane coating
    Patent number: 6274639
    Abstract: An improved durable, low density, high build polyurethane coating is disclosed, as well as its method of manufacture. A slow reacting polyisocyanate is combined with a polyol so as to form a uniform mixture with an extremely long pot life. The low viscosity uniform mixture can then be sprayed onto a substrate using a conventional spray gun. A polyurethane catalyst is introduced after formation of the uniform mixture, preferably via a second spray nozzle so that catalyst is externally mixed into the polyisocyanate/polyol spray stream. This is a 100%, or near 100%, solids system so that there is very low volatile organic compound emissions.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: August 14, 2001
    Assignee: Lockheed Martin Corporation
    Inventors: James E. Foreman, Douglas R. Dowell, Bobby G. Isler
  • High build polyurethane coating
    Patent number: 6084001
    Abstract: An improved durable, low density, high build polyurethane coating is disclosed, as well as its method of manufacture. A slow reacting polyisocyanate is combined with a polyol so as to form a uniform mixture with an extremely long pot life. The low viscosity uniform mixture can then be sprayed onto a substrate using a conventional spray gun. A polyurethane catalyst is introduced after formation of the uniform mixture, preferably via a second spray nozzle so that catalyst is externally mixed into the polyisocyanate/polyol spray stream. This is a 100%, or near 100%, solids system so that there is very low volatile organic compound emissions.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: July 4, 2000
    Assignee: Lockheed Martin Corporation
    Inventors: James E. Foreman, Douglas R. Dowell, Bobby G. Isler
  • Electromagnetic attenuating laminate and method for its formation
    Patent number: 5885911
    Abstract: An EMI shielding member and method of making the member. The member includes a non-metallic substrate having an electrically non-conductive coating of a dielectric polymer matrix material loaded with an EMI shieldingly effective amount of electrically conductive fibers. The member can be formed by spraying the fiber loaded, dielectric polymer matrix onto a flexible fabric or tape.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: March 23, 1999
    Assignee: Martin Marietta Corporation
    Inventors: H. Carl Ashcraft, Walter B. May, Douglas R. Dowell
  • Electromagnetic attenuating laminate and method for its formation
    Patent number: 5721019
    Abstract: An EMI shielding member and method of making the member. The member includes a non-metallic substrate having an electrically non-conductive coating of a dielectric polymer matrix material loaded with an EMI shieldingly effective amount of electrically conductive fibers. The member can be formed by spraying the fiber loaded, dielectric polymer matrix onto a flexible fabric or tape.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 24, 1998
    Assignee: Martin Marietta Corporation
    Inventors: H. Carl Ashcraft, Walter B. May, Douglas R. Dowell