Patents by Inventor Peter R. Johns

Peter R. Johns 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).

  • Noble metal complexes to sensitize silver halide emulsions
    Patent number: 5556742
    Abstract: Silver halide photographic emulsions may be sensitized by the use of hydrido-phosphine noble metal compounds and especially platinum (II) compounds.
    Type: Grant
    Filed: August 30, 1995
    Date of Patent: September 17, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Charles G. Barlow, Peter R. Johns, Peter D. Sills