Patents Assigned to Argiles et Mineraux
  • Biological fermentation substrates
    Patent number: 4221657
    Abstract: Fired clays, in the form of medium-sized granulates containing small quantities of trace elements which serve as nutrients for microorganisms, are used as substrates for biological filters.
    Type: Grant
    Filed: September 20, 1978
    Date of Patent: September 9, 1980
    Assignees: Omnium d'Assainissement, Argiles et Mineraux
    Inventor: Yves Lebesgue