Patents by Inventor Marcel Frans Aelterman

Marcel Frans Aelterman 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).

  • Hardening developers for silver halide photography
    Patent number: 4078932
    Abstract: A hardening developer is described which comprises at least one silver halide developing agent and a reaction product of a dialdehyde hardener with an aliphatic alcohol.
    Type: Grant
    Filed: April 20, 1976
    Date of Patent: March 14, 1978
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Edwin Hendrik Hazenbosch, Marcel Frans Aelterman, Gerard Laurens Vanreusel
  • Processing of photographic silver halide material
    Patent number: 4059446
    Abstract: Sludge formation is reduced in the fixing and washing station of an automatic processing apparatus for rapid processing exposed photographic elements, by addition to the fixing and/or washing medium of a compound of the formula:R(OCH.sub.2 CH.sub.2).sub.n OHwherein n is at least 12 and R is an aliphatic group of 6 to 24 carbon atoms or an alkylaryl group.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: November 22, 1977
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Edwin Hendrik Hazenbosch, Antoine Roberta Van Rossen, Roland Francois Beels, Marcel Frans Aelterman
  • Apparatus for processing photographic film and recovering solid substances from the processing solutions used
    Patent number: 3995298
    Abstract: An apparatus of small dimensions may be used to operate the water contained in the processing baths of automatic processing machines. The solid residue may be collected and sent to silver recovery plants, whereas the evaporated water serves to heat the drying station of the processing machine whereinafter it may be fed to the washing station. In so doing, a considerable amount of wash water is recovered and no chemical compounds are discharged to the sewer through which pollution of surface waters is practically eliminated.
    Type: Grant
    Filed: November 6, 1974
    Date of Patent: November 30, 1976
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Camille Angelina Vandeputte, Marcel Robert Fierens, Marcel Frans Aelterman