Patents by Inventor Richard S. Fisch

Richard S. Fisch 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).

  • Low contrast, rapid access, air stable, regenerable iron chelate developer solutions
    Patent number: 3938998
    Abstract: Low contrast, rapid access, air stable, regenerable iron chelate developer solutions comprising at least two developer materials, at least one selected from each group comprising:1. iron chelate developers and2. amidol, gallic acid, tannic acid, and 2,5,di-tert-butyl hydroquinone.
    Type: Grant
    Filed: March 28, 1975
    Date of Patent: February 17, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard S. Fisch, Norman Newman
  • Rapid access, air stable, regenerable iron chelate developer solutions
    Patent number: 3938997
    Abstract: Rapid access, air stable, regenerable iron chelate developers comprising at least three developer materials, at least one selected from each of the groups comprising:1. iron chelate developers2. an ascorbic acid and3. phenidone, glycin, cysteine hydrochloride, hydroxylamine sulfate, hydroquinone monosulfonate and 4-amino-N-ethyl-N-(.beta.-methanesulfoneamidoethyl)-m-toludine.
    Type: Grant
    Filed: March 28, 1975
    Date of Patent: February 17, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard S. Fisch, Norman Newman