Patents by Inventor Timothy Kevin Brierley

Timothy Kevin Brierley 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).

  • Patent number: 6215013
    Abstract: A method for the preparation of alkene phosphonic acids and salts thereof, such as VDPA (vinylidene diphosphonic acid) is disclosed. The products can be produced in a stable, substantially pure form and in high yield. The method includes the azeotropic removal of water from salts of &agr;-hydroxy-alkane diphosphonic acid dimer or corresponding acids thereof, and the pyrolysis of the dehydrated reactant at a temperature of from 170° C. to 300° C. There may be included a step to convert anhydrides which have been formed during the pyrolysis. The method may include the use of heat transfer agents and/or bases, and may be carried out at elevated or reduced pressure.
    Type: Grant
    Filed: September 5, 2000
    Date of Patent: April 10, 2001
    Assignee: Rhodia Consumer Specialties Limited
    Inventors: Gary Woodward, Timothy Kevin Brierley, Ranbir Singh Padda, John Christopher Harris, Aidan Michael Hayes