Patents by Inventor Colleen E. Micklethwaite

Colleen E. Micklethwaite 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).

  • Method of preparing a phosphine compound
    Patent number: 5250736
    Abstract: Allylphosphines and vinylphosphines are prepared by reaction of a phosphine with an allylhalide or a vinylhalide, respectively. Preferably the phosphine is a secondary phosphine, so that there is formed an allyldialkylphosphine or a dialkylvinylphosphine. The allyldialkylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,3-bis-(dialkylphosphino)propane. The dialkylvinylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,2 bis-(dialkylphosphino)ethane. These compounds are useful as bidentate ligands.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: October 5, 1993
    Assignee: Cyanamid Canada Inc.
    Inventors: Colleen E. Micklethwaite, Allan J. Robertson