Patents by Inventor Marc J. Scheerders

Marc J. Scheerders 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: 5133846
    Abstract: Silver is recovered from the rinse water from a photographic film processing unit by means of a silver recovery device in which the rinse water is passed through at least one bed of ion exchange resin particles maintained in fluidized condition by the water flow. A plurality of such beds are preferably connected in series with rinse water being recirculated until fresh rinse water causes overflow to the next bed and finally to a collection vessel. Fluidization is interrupted periodically to create quiescent periods which aid in removal from the resin particles of accumulated gelatin from the processed film.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: July 28, 1992
    Assignee: AGFA-Gevaert N. V.
    Inventors: Marc A. De Niel, Herman M. Engels, Marc J. Scheerders, Dirk F. De Ruijter, Bartolomeus J. Verlinden, Benedictus J. Jansen