Patents by Inventor Duncan Carmichael

Duncan Carmichael 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).

  • Diphosphines
    Publication number: 20040133042
    Abstract: A non-symmetrical diphosphine of the formula
    Type: Application
    Filed: December 17, 2003
    Publication date: July 8, 2004
    Inventors: John Michael Brown, Duncan Carmichael, Henry Doucet
  • Diphosphines
    Patent number: 6706926
    Abstract: A non-symmetrical diphosphine of the formula R1R2P—(Z)—PR3R4 wherein Z represents a chain of 2 to 4 carbon atoms which may be substituted, which chain may be saturated or unsaturated, and R1, R2, R3 and R4, which may be the same or differ, are aliphatic, aromatic or heteroaromatic groups attached to the phosphorus by carbon, nitrogen, oxygen or sulphur such that each phosphorus atom and its substituents independently form a single enantiomer.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: March 16, 2004
    Assignee: Isis Innovation Limited
    Inventors: John Michael Brown, Duncan Carmichael, Henry Doucet