Patents by Inventor Harold Messerschmidt

Harold Messerschmidt 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).

  • Method for recovering silver from waste photographic film and paper
    Patent number: 4759914
    Abstract: Silver is recovered from photographic emulsion by a process comprising oxidizing whereby the emulsion is oxidized with an acid solution of 10-26 percent ferric chloride at a pH of up to about 2.
    Type: Grant
    Filed: October 23, 1987
    Date of Patent: July 26, 1988
    Assignee: Argentum International Incorporated
    Inventor: Harold Messerschmidt