Patents by Inventor Michael J. Hjelm

Michael J. Hjelm 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).

  • Fire-resistant resin
    Patent number: 4019922
    Abstract: A liquid polymerizable material which may be used, for instance, for the coating of wood or other substrate, which material, when cured, is fire-resistant and protects the substrate. The material cures without application of heat and is formed from methyl methacrylate monomer, a hydroxy alkylacrylate or diacetone acrylamide monomer, a chlorinated hydrocarbon, an antimony compound, a zinc compound, a filler, and a catalyst-promoter system.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: April 26, 1977
    Assignee: Advance Coatings Company
    Inventors: Howard A. Whittum, Michael J. Hjelm
  • Fire-resistant resin
    Patent number: 3940549
    Abstract: A liquid polymerizable material which may be used, for instance, for the coating of wood or other substrate, which material, when cured, is fire-resistant and protects the substrate. The material cures without application of heat and is formed from methyl methacrylate monomer, a hydroxy alkylacrylate or diacetone acrylamide monomer, a chlorinated hydrocarbon, an antimony compound, a zinc compound, a filler, and a catalyst-promoter system.
    Type: Grant
    Filed: March 30, 1973
    Date of Patent: February 24, 1976
    Assignee: Advance Coatings Co.
    Inventors: Howard A. Whittum, Michael J. Hjelm