Patents by Inventor Leon Petrakis

Leon Petrakis 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).

  • Use of reagents to convert chrysotile and amosite asbestos used as insulation or protection for metal surfaces
    Patent number: 6160195
    Abstract: A composition for converting asbestos-containing material, covering metal pipes or other metal surfaces, to non-regulated, environmentally benign-materials, and inhibiting the corrosion of the metal pipes or other metal surfaces. The composition comprises a combination of at least two multiple-functional group reagents, in which each reagent includes a Fluro acid component and a corrosion inhibiting compoment. A method for converting asbestos-containing material, covering metal pipes or other metal surfaces, to non-regulated, environmentally benign-materials, and inhibiting the corrosion of the metal pipes or other metal surfaces is also provided.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: December 12, 2000
    Assignee: Brookhaven Science Associates
    Inventors: Toshifumi Sugama, Leon Petrakis
  • Use of super acids to digest chrysotile and amosite asbestos in simple mixtures or matrices found in building materials compositions
    Patent number: 6005158
    Abstract: A composition for converting asbestos-containing material to environmentally benign components is provided. The composition comprises a flouro acid decomposing agent which can be applied to either amosite-containing thermal insulation or chrysotile-containing fire-proof material or to any asbestos-containing material which includes of chrysotile and amosite asbestos. The fluoro acid decomposing agent includes FP(O)(OH).sub.2, hexafluorophosphoric acid, a mixture of hydrofluoric and phosphoric acid and a mixture of hexafluorophosphoric acid and phosphoric acid. A method for converting asbestos-containing material to environmentally benign components is also provided.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: December 21, 1999
    Assignee: Brookhaven Science Associates LLC
    Inventors: Toshifumi Sugama, Leon Petrakis, Ronald P. Webster
  • Chemical agents for conversion of chrysotile asbestos into non-hazardous materials
    Patent number: 5763738
    Abstract: A composition and methods for converting a chrysotile asbestos-containing material to a non-regulated environmentally benign solid which comprises a fluoro acid decomposing agent capable of dissociating the chrysotile asbestos to non-regulated components, wherein non-regulated components are non-reactive with the environment, and a binding agent which binds the non-regulated components to form an environmentally benign solid.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: June 9, 1998
    Assignee: Associated Universities, Inc.
    Inventors: Toshifumi Sugama, Leon Petrakis
  • Magnetic separation method utilizing a colloid of magnetic particles
    Patent number: 4526681
    Abstract: A method of magnetically separating particles having different magnetic susceptibilities. A magnetic field is established in a colloidal suspension of magnetic particles which distribute to form a magnetic susceptibility gradient. The particles to be separated are introduced into the colloidal suspension. The introduced particles migrate along the magnetic susceptibility gradient to different regions having approximately the same magnetic susceptibilities as the introduced particles.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 2, 1985
    Assignee: Purdue Research Foundation
    Inventors: Fritz J. Friedlaender, Makoto Takayasu, Jiann-Yang Hwang, Leon Petrakis