Patents by Inventor Chun Y. Lo

Chun Y. Lo 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).

  • Non-leachable fire retardant comprising an alkaline condensation product of a fusible phenolic resin and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate
    Patent number: 5432247
    Abstract: A fusible phenolic resin and a dialkyl-N,N-bis(hydroxyalkyl)aminoalkyl phosphonate are condensed to form a water-insoluble resin having fire retardant properties. Fire resistant materials are made by causing the condensation to occur in situ when a normally flammable material and the reactants are mixed and the mixture is heated at 250.degree. F. to 480.degree. F. Wooden articles such as molded hardboard roofing shingles of this invention do not lose their fire resistance after being soaked with rain repeatedly.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: July 11, 1995
    Assignee: Masonite Corporation
    Inventors: Chun Y. Lo, Thomas A. Lehtinen
  • Roofing material containing non-leachable fire retardant comprising an alkaline condensation product of a fusible phenolic resin and a dialkyl-n,n-bis(hydroxyalkyl) aminoalkyl phosphonate
    Patent number: 5281486
    Abstract: A fusible phenolic resin and a dialkyl-N, N-bis (hydroxyalkyl) aminoalkyl phosphonate are condensed to form a water-insoluble resin having fire retardant properties. Fire resistant materials are made by causing the condensation to occur in situ when a normally flammable material and the reactants are mixed and the mixture is heated at 250.degree. F. to 480.degree. F. Wooden articles such as molded hardboard roofing shingles of this invention do not lose their fire resistance after being soaked with rain repeatedly.
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: January 25, 1994
    Assignee: Masonite Corporation
    Inventors: Chun Y. Lo, Lehtinen Thomas A.
  • Non-leachable fire retardant
    Patent number: 5143989
    Abstract: A fusible phenolic resin and a dialkyl-N, N-bis (hydroxyalkyl) aminoalkyl phosphonate are condensed to form a water-insoluble resin having fire retardant properties. Fire resistant materials are made by causing the condensation to occur in situ when a normally flammable material and the reactants are mixed and the mixture is heated at 250.degree. F. to 480.degree. F. Wooden articles such as molded hardboard roofing shingles of this invention do not lose their fire resistance after being soaked with rain repeatedly.
    Type: Grant
    Filed: September 23, 1988
    Date of Patent: September 1, 1992
    Assignee: Masonite Corporation
    Inventors: Chun Y. Lo, Thomas A. Lehtinen