Patents by Inventor John Kiwi

John Kiwi 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).

  • Mixed ruthenium catalyst
    Patent number: 4847231
    Abstract: A catalyst having a mixture of Ru and RuO.sub.x, wherein x is greater than 0 and equal to or less than 2, supported by a suitable metal oxide support material is suitable for the heterogeneous catalytic gas phase direct methane production from hydrogen and carbon dioxide at mild temperatures as low as 25.degree. C. and atmospheric pressure. Photo-methanation using such catalysts having photoexcitable support materials significantly increases the rate of methane production and the methane yield, yielding almost stoichiometrically quantitative amounts of methane according to the Sabatier reaction.
    Type: Grant
    Filed: June 8, 1988
    Date of Patent: July 11, 1989
    Assignee: Gas Research Institute
    Inventors: Michael Gratzel, John Kiwi, Krishnan R. Thampi
  • Photolytic production of hydrogen from water
    Patent number: 4421617
    Abstract: A catalytic dispersion of fine metal particles mediates the photodissociation of water into hydrogen gas. A protective agent adsorptive to said particles and selected from among homopolymers, copolymers, hydrocarbyl radicals and polysaccharides stabilizes the said dispersion.
    Type: Grant
    Filed: September 21, 1982
    Date of Patent: December 20, 1983
    Assignee: Engelhard Corporation
    Inventors: Michael Gratzel, John Kiwi
  • Catalyst for the photolytic production of hydrogen from water
    Patent number: 4394293
    Abstract: A catalytic dispersion of fine metal particles mediates the photodissociation of water into hyrogen gas. A protective agent adsorptive to said particles and selected from among homopolymers, copolymers, hydrocarbyl radicals and polysaccharides stabilizes the said dispersion.
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: July 19, 1983
    Assignee: Engelhard Corporation
    Inventors: Michael Gratzel, John Kiwi
  • Simultaneous production of hydrogen and oxygen from water
    Patent number: 4382846
    Abstract: A method for the simultaneous production of hydrogen and oxygen from water by the visible light irradiation of a water solution containing photosensitizer, an electron relay and a suitable combination of redox catalysts.
    Type: Grant
    Filed: May 7, 1982
    Date of Patent: May 10, 1983
    Assignee: Engelhard Corporation
    Inventors: Michael Gratzel, John Kiwi, Kuppuswamy Kalyanasundaram, John Philp
  • Photoelectrochemical system and a method of using the same
    Patent number: 4381978
    Abstract: A photoelectrochemical system for conducting endoergic chemical processes driven by light energy. This system consists essentially of an illuminated halfcell and a darkened halfcell joined via electrodes and an external circuit to allow for the transport of electrons. Also, the said halfcells are joined by an ion conducting junction so as to allow for the transport of ions. The illuminated halfcell contains a photosensitizer, an electron relay substance and a catalyst, and the darkened halfcell may contain a second electron relay and a catalyst. Illumination with visible light results in the simultaneous and separate generation of oxidation and reduction products.
    Type: Grant
    Filed: August 14, 1981
    Date of Patent: May 3, 1983
    Assignee: Engelhard Corporation
    Inventors: Michael Gratzel, John Kiwi, Kuppuswamy Kalyanasundaram, John Philp