Using Microwave Energy Patents (Class 204/157.43)
  • Patent number: 6258329
    Abstract: A system for carrying out microwave assisted chemical reactions is disclosed. The system includes a source of microwave radiation; a cavity in communication with the source, an attenuator in communication with the cavity for providing access to the cavity while preventing microwaves from escaping through the attenuator, and a vessel positioned in the cavity and the attenuator and extending externally of the attenuator for holding materials in the cavity while microwaves from the source are applied thereto. The vessel includes a reaction chamber and a venting portion. The chamber portion is positioned entirely within the cavity, and the venting portion extends from the cavity and through the attenuator and externally of the attenuator and has a gas passage for permitting gases to flow to or from the reaction portion from gas sources external to the cavity, the attenuator, and the vessel.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: July 10, 2001
    Assignee: CEM Corporation
    Inventors: James Nelson Mutterer, Jr., Wyatt Price Hargett, Jr.
  • Patent number: 6228337
    Abstract: Uranium trioxide Is reduced to uranium dioxide using microwave radiation or radiofrequency radiation directed in such a way that the radiation encounters an Interface between uranium trioxide and the uranium-containing reduction product without first having passed through that product. By this method, and also using a reducing gas, it is possible to obtain UO2 with an O:U ratio less than 2.04:1.
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: May 8, 2001
    Assignee: Cameco Corporation
    Inventor: Mikhail Simonovich Ioffe
  • Patent number: 6207024
    Abstract: A method of producing phosphorus in which a mixture of phosphoric acid and carbon reductant is exposed to microwaves at a power level sufficient to heat the mixture to a temperature at which phosphorous is produced. This method can be carried out at lower temperatures than conventional phosphorous production and does not give rise to the solid waste normally formed in conventional phosphorous production. The phosphorus thus formed can be converted back to phosphoric acid, thus effecting purification of the phosphoric acid.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: March 27, 2001
    Assignee: Astaris LLC
    Inventor: Richard R. Severns
  • Patent number: 6207023
    Abstract: A process of air purification occurs in the presence of activated carbon or its equivalent by decomposing adsorbed hazardous materials, such as volatile organic compounds, on the carbon surface by radiofrequency energy in the microwave range at near ambient conditions of temperature and pressure. Further microwave oxidation to nonhazardous gases occurs in the presence of an oxidation catalyst.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: March 27, 2001
    Inventor: Chang Yul Cha
  • Patent number: 6203670
    Abstract: Provided is a process for grafting a substituted difluoromethyl group onto a compound bearing at least one electrophilic substituent, comprising (i) contacting the compound bearing at least one electrophilic substituent with a nucleophilic reagent which comprises (a) a fluorocarboxylic acid having the formula Ea—CF2—COOH, wherein Ea is an electron-withdrawing atom or group, the fluorocarboxylic acid being at least partially salified with an organic or inorganic cation and (b) a polar aprotic solvent, and (ii) exposing the resulting medium of reaction to the action of microwave energy.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: March 20, 2001
    Assignee: Rhodia Chimie
    Inventors: GĂ©rard Forat, Jean-Manuel Mas, Laurent Saint-Jalmes
  • Patent number: 6187988
    Abstract: This process occurs in the presence of activated carbon or its equivalent by decomposing adsorbed hazardous materials, such as hydrazine and microorganisms, on the carbon surface by radiofrequency energy in the microwave range at near ambient conditions of temperature and pressure. Further microwave oxidation to nonhazardous gases occurs in the presence of a microwaves enhanced oxidation catalyst.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: February 13, 2001
    Inventor: Chang Yul Cha
  • Patent number: 6179970
    Abstract: Compounds containing a primary amino group are converted into compounds containing a fluorine atom in place of the amino group by reaction of the amino compound with hydrogen fluoride and a nitrosating reagent under the influence of ultrasound or microwaves.
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: January 30, 2001
    Assignee: Rhodia Limited
    Inventors: Paul Coe, Tony Waring, Claude Mercier