Patents by Inventor Andrew D. J. Broome

Andrew D. J. Broome 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: 4891207
    Abstract: Manufacture of arsenic acid by oxidation of arsenic trioxide with hydrogen peroxide is potentially hazardous, especially when making concentrated solutions of arsenic acid as sought by the users. The process also can suffer from substantial wasteful decomposition of hydrogen peroxide. The problems arise from or are exacerbated by the nature of the reactants, the exothermic character of the principal and decomposition reactions and the formation of localized hot spots.The problems can be ameliorated by introducing the reagents with agitation into a body of reaction product and maintaining the reaction mixture at a temperature of not more than C. and preferably to C. By carrying out the process in such a manner, it can accomodate even low grade arsenic trioxide as reagent.
    Type: Grant
    Filed: March 6, 1986
    Date of Patent: January 2, 1990
    Inventor: Andrew D. J. Broome
  • Patent number: 4804494
    Abstract: A copper arsenate composition suitable for incorporation in a copper/chrome/arsenic wood preservative composition is made by reacting copper metal with a source of 5-valent arsenic such as arsenic acid under the oxidizing influence of hydrogen peroxide. The quantity of arsenic acid used may be made consistent with the arsenic to copper ratio required in the final wood preservative composition which may be made up by including a suitable source of chromium with the copper arsenate reaction product.
    Type: Grant
    Filed: April 23, 1987
    Date of Patent: February 14, 1989
    Assignee: Laporte Industries Limited
    Inventors: Ian K. Egerton, Andrew D. J. Broome
  • Patent number: 4797281
    Abstract: Wood preservative compositions containing as active ingredients compounds of copper, of chromium and of arsenic are produced by mixing copper arsenate and sodium dichromate in an aqueous medium into which is introduced strong acid, for example sulphuric acid, effective to achieve a soluble product. The acid addition is preferably effective to reduce the pH to below 0. The composition so produced is a homogeneous paste which may be dissolved in water to working concentration and used for the preservation of wood by impregnation techniques.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: January 10, 1989
    Assignee: Laporte Industries Limited
    Inventors: Andrew D. J. Broome, Ian K. Egerton