Patents by Inventor David R. Sterrenburg

David R. Sterrenburg 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).

  • Preparation of dialkyl allylphosphonic acid diesters
    Patent number: 5177238
    Abstract: An improved process for the production of allylphosphonic acid dialkyl esters in high yield and selectivity by the gradual addition of trialkyl phosphite to react with the appropriate allyl halide in the presence of a divalent nickel catalyst and, optionally, a polymerization inhibiting compound, e.g. hydroquinone.
    Type: Grant
    Filed: July 16, 1991
    Date of Patent: January 5, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Charles G. Carter, David R. Sterrenburg
  • Preparation of allylphosphonic acid
    Patent number: 5142084
    Abstract: A novel process for rearranging triallyl phosphite to diallyl allylphosphonate ester is disclosed. The process involves heating triallyl phosphite in the presence of a soluble, inorganic bromide or iodide catalyst. The rearrangement process is useful in a 3-step process for the preparation allylphosphonic acid from trialkyl phosphite without the isolation of intermediates.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: August 25, 1992
    Inventors: Charles G. Carter, David R. Sterrenburg