Patents by Inventor Christine B. Hetzer

Christine B. Hetzer 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).

  • Dissolving insecticide in monomer
    Patent number: 6080796
    Abstract: Insecticides, and particularly termiticides, may be dissolved in monomers polymerized to form foamable polymers, such as polystyrene. The resulting monomer and insecticide may then be polymerized in a conventional manner and either impregnated with a blowing agent or expanded using an extrusion process to produce polymeric foam having insecticidal properties. The polymer may also contain a flame retardant. Such polymers and the foam made therefrom may be used in the construction industry, particularly where insect infestation is a concern.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: June 27, 2000
    Assignee: Nova Chemicals Inc.
    Inventors: Rebecca B. Liebert, Christine B. Hetzer
  • Impregnating polymer beads with insecticide
    Patent number: 6033731
    Abstract: Polymeric beads made by a suspension or an emulsion process may be concurrently impregnated with blowing agent, an insecticide and a flame retardant, if required. The resulting bead is then washed and dried and then may be used for making a foam structure such as a sheet. The resulting foam sheet may be used in the construction industry, particularly where there is a concern of insect infestation.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: March 7, 2000
    Assignee: Nova Chemicals, Inc.
    Inventors: Rebecca B. Liebert, Christine B. Hetzer