Patents by Inventor Jack A. Duisman

Jack A. Duisman 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).

  • Chromatographic separations using a unique silica polymorph
    Patent number: 4375568
    Abstract: Chromatographic separation of mixtures containing low molecular weight alcohols, ethylene glycol, phenol and water are made in the liquid and gas phase using as a column packing a unique crystalline silica polymorph, synthesized hydrothermally from a reaction system containing silica, water, an alkylonium base and fluoride anions.
    Type: Grant
    Filed: February 4, 1981
    Date of Patent: March 1, 1983
    Assignee: Union Carbide Corporation
    Inventors: Thomas P. J. Izod, Jack A. Duisman
  • Cadmium sulfide photovoltaic cell and method of fabrication
    Patent number: 4143235
    Abstract: A cadmium sulfide photovoltaic cell of improved efficiency comprising a barrier layer and cadmium sulfide-containing bilayer, the bilayer being formed by depositing at a first temperature an initial layer of cadmium sulfide in interfacial contact with the substrate and then depositing a subsequent layer of cadmium sulfide at a second temperature which is at least 20.degree. C. below the first temperature.
    Type: Grant
    Filed: December 30, 1977
    Date of Patent: March 6, 1979
    Assignee: Chevron Research Company
    Inventor: Jack A. Duisman