Patents by Inventor Peter R. Wardle

Peter R. Wardle 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).

  • Process for producing an ammonium thiosulfate product
    Patent number: 5618658
    Abstract: A substantially sulfur-free ammonium thiosulfate containing product can be produced by spray drying an aqueous solution containing ammonium thiosulfate and effective stabilizing amounts of both a carbonate component and a sulfite component under effective conditions to provide a substantially sulfur-free product. The carbonate component is selected from among ammonium carbonate or bicarbonate, an alkali metal carbonate or bicarbonate, or an alkaline metal carbonate or bicarbonate while the sulfite component is an ammonium sulfite or bisulfite, alkali metal sulfite or bisulfite, or an alkaline metal sulfite or bisulfite.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: April 8, 1997
    Assignee: Fuji Hunt Photographic Chemicals, Inc.
    Inventors: Malcolm S. Penman, Edward C. Saunders, Peter R. Wardle
  • Can opener
    Patent number: D346939
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: May 17, 1994
    Inventor: Peter R. Wardle