Patents by Inventor Roderic Nigel Fraser Simpson

Roderic Nigel Fraser Simpson 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).

  • Synthesis of fluorinated ethers
    Patent number: 6225511
    Abstract: Fluorinated ethers of the formula: wherein R is hydrogen, fluorine, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, R′ is hydrogen, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, and R″ is fluorine, alkyl of 1 to 6 carbon atoms or fluoroalkyl of 1 to 6 carbon atoms are prepared by fluorinating a corresponding ether of formula: with a solid transition metal fluoride fluorinating agent such as cobaltic fluoride.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: May 1, 2001
    Assignee: Rhone-Poulenc Chemicals Ltd.
    Inventors: Owen Ross Chambers, Roderic Nigel Fraser Simpson
  • Synthesis of fluorinated ethers
    Patent number: 6054626
    Abstract: Fluorinated ethers of the formula: ##STR1## wherein R is hydrogen, fluorine, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, R' is hydrogen, alkyl of 1 to 6 carbon atoms, or fluoroalkyl of 1 to 6 carbon atoms, and R" is fluorine, alkyl of 1 to 6 carbon atoms or fluoroalkyl of 1 to 6 carbon atoms, e.g. Desflurane, are prepared by fluorinating a corresponding ether of formula: ##STR2## with a solid transition metal fluoride fluorinating agent such as cobaltic fluoride.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: April 25, 2000
    Assignee: Rhodia Limited
    Inventors: Owen Ross Chambers, Roderic Nigel Fraser Simpson