Patents by Inventor Ivan C. Payne

Ivan C. Payne 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).

  • Electrolytic recovery of silver from photographic bleach-fix baths
    Patent number: 4211630
    Abstract: This invention relates to the recovering of metallic silver from photographical bleach-fix baths. An electric current is passed through a bleach-fix solution containing silver ions and ferric ions, which solution has been brought to a predetermined redox potential by the addition of a reducing agent. The cathode is of the type wherein reduced silver ions can deposit thereon as metallic silver. The redox potential of the electrolyte solution is continuously monitored and a reducing agent is added automatically when the redox potential rises above a predetermined level. When the redox potential drops below a predetermined level the addition of the reducing agent is automatically stopped.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: July 8, 1980
    Assignee: Ciba-Geigy AG
    Inventors: Colin C. Blake, Ivan C. Payne
  • Electrolytic recovery of silver from photographic bleach-fix baths
    Patent number: 4186067
    Abstract: This invention relates to the recovering of metallic silver from photographical bleach-fix baths. An electric current is passed through a bleach-fix solution containing silver ions and ferric ions, which solution has been brought to a predetermined redox potential by the addition of a reducing agent. The cathode is of the type wherein reduced silver ions can deposit thereon as metallic silver. The redox potential of the electrolyte solution is continuously monitored and a reducing agent is added automatically when the redox potential rises above a predetermined level. When the redox potential drops below a predetermined level the addition of the reducing agent is automatically stopped.
    Type: Grant
    Filed: August 17, 1978
    Date of Patent: January 29, 1980
    Assignee: Ciba-Geigy Aktiengesellschaft
    Inventors: Colin C. Blake, Ivan C. Payne