Patents by Inventor Marcel Robert Fierens

Marcel Robert Fierens 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 fixer for photographic silver halide material
    Patent number: 4046570
    Abstract: A hardening fiber composition for use in the processing of photographic silver halide elements is described which contains a 1-hydroxy-alkylidene diphosphonic acid the alkylidene group of which contains from 2 to 5 C-atoms.
    Type: Grant
    Filed: May 27, 1976
    Date of Patent: September 6, 1977
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Marcel Robert Fierens, Renaat Frans Heylen
  • 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