Patents by Inventor Peter Michael Quan

Peter Michael Quan 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).

  • Chemical process
    Patent number: 5728853
    Abstract: A process for extracting metal values, especially zinc values, from aqueous solutions of metal salts, which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula, ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom from a 5- to 8-membered heterocyclic ring.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: March 17, 1998
    Assignee: Zeneca Limited
    Inventors: John Campbell, Raymond Frederick Dalton, Peter Michael Quan
  • Reduction of nitro compounds with aqueous solutions of a formate
    Patent number: 4093646
    Abstract: A process for the reduction of organic nitro compounds containing groups which confer solubility in water comprising treatment of said compounds with an aqueous solution of a formate in presence of a hydrogenation catalyst.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: June 6, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter Bamfield, Peter Michael Quan, Trevor James Smith
  • Method for dehalogenating aromatic compounds
    Patent number: 4022795
    Abstract: Dehalogenation of water-immiscible or sparingly soluble aromatic compounds containing chlorine or bromine by contacting with an aqueous solution of a formic acid salt in presence of a hydrogenation catalyst and a surface active agent.
    Type: Grant
    Filed: August 19, 1975
    Date of Patent: May 10, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter Bamfield, Peter Michael Quan