Patents Assigned to Plavina & Cie. (Societe en Nom Collectif)
  • Process for preventing the formation of black spots on the walls of underground water reservoirs
    Patent number: 5714076
    Abstract: A method for preventing the formation of black marks on the walls of sunken pools containing water contaminated by copper ions, which consists in treating the water using an effective amount of a metal sulfide having a water solubility at least equal to the solubility of copper sulfide. The treatment reduces the concentration of copper ions in the water and prevents the formation of black marks on the walls.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: February 3, 1998
    Assignee: Plavina & Cie (Societe en Nom Collectif)
    Inventor: Hans Tanghe
  • Impermeable membrane resistant to chemical agents and impermeable enclosure produced using such membranes
    Patent number: 5006377
    Abstract: An impermeable membrane contains at least one flexible support layer made of a polymer containing chlorine, at least one adhesive layer consisting of a copolyamide whose degree of crystallization is less than 20% and a film of a polymer containing fluorine.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: April 9, 1991
    Assignee: Plavina & Cie (Societe en Nom Collectif)
    Inventors: Michel Delcorps, Hans Tanghe
  • Flexible sealing membrane, particularly for roofs, which comprises a thermoplastic material reinforced with a mesh of synthetic fibres and with a mesh of glass fibres
    Patent number: 4749609
    Abstract: The sealing membrane comprises a thermoplastic resin and a reinforcing system consisting of a mesh of glass fibres and a mesh of synthetic fibres, the reinforcing meshes being so selected that if the membrane is subjected to a progressive tensile load the tension applied at the moment of the rupture of the glass fibre mesh will as a maximum be equal to 90% of the tensile strength of the synthetic fibre mesh.
    Type: Grant
    Filed: May 21, 1985
    Date of Patent: June 7, 1988
    Assignee: Plavina & Cie. (Societe en Nom Collectif)
    Inventor: Claude Lempereur