Patents by Inventor Donald J. Brugger

Donald J. Brugger 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).

  • Patent number: 4036715
    Abstract: An improved practical and highly efficient electrolytic method for concurrently recovering silver from photographic bleach-fix solutions which contain iron, and regenerating the bleach-fix for reuse. A substantial improvement in current efficiency at low current densities is realized by a combination of (a) adding a reductant such as sodium dithionite before electrolysis, as a reducing agent for ferric ions in the bleach-fix solution, (b) maintaining a non-oxidizing atmosphere in the cell, and (c) providing either a cation permeable membrane or a porous alundum membrane between the electrolytic cell anode and cathode, to separate a first pool of bleach-fix catholyte from a second pool of a different salt solution such as sodium carbonate as anolyte.
    Type: Grant
    Filed: December 20, 1971
    Date of Patent: July 19, 1977
    Assignee: Eastman Kodak Company
    Inventors: Harry C. Baden, Charleton C. Bard, Donald J. Brugger