Patents by Inventor Stephen Geoffrey Warren

Stephen Geoffrey Warren 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).

  • COATING TECHNOLOGY
    Publication number: 20130334056
    Abstract: The present invention provides an aqueous platinum electroplating bath including: a) a source of platinum ions; and b) a source of polyphosphate anions, and wherein the bath has a pH in the range from about 2 to about 9 when it is in use or ready for use. The aqueous platinum electroplating bath may optionally include one or more levellers. The invention also provides the use of the platinum electroplating bath and platinum salts suitable for use in the bath.
    Type: Application
    Filed: January 12, 2012
    Publication date: December 19, 2013
    Applicant: JOHNSON NATTHEY PUBLIC LIMITED COMPANY
    Inventors: Laura Ashfield, Allan Rein Berzins, Alan Boardman, Stephen Geoffrey Warren
  • Metal salts
    Patent number: 7138545
    Abstract: Alkali metal carboxylate salt brines, such as cesium formate brine, are used in oil and gas drilling procedures. Contamination with chloride ions can be controlled by treatment with a silver salt solution, and removing silver chloride formed. High density brines can be obtained, suitable for re-use.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: November 21, 2006
    Assignees: Johnson Matthey Public Limited Company, Aubin Limited
    Inventors: James Murray, Edmund Austin Tobin, Stephen Geoffrey Warren
  • Process for the production of ruthenium (III) acetate solution
    Patent number: 5886204
    Abstract: A process for the production of ruthenium (III) acetate solution which comprises reacting ruthenium (IV) oxide with a stoichiometric amount of a hydrazine reductant in the presence of acetic acid.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: March 23, 1999
    Assignee: BP Chemicals Limited
    Inventors: Stephen Geoffrey Warren, Anthony Fulford