Patents by Inventor Roger Thouvenot

Roger Thouvenot 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).

  • Solutions based on polyvinyl chloride, the process for their preparation and yarns and fibres thus obtained
    Patent number: 4529768
    Abstract: The present invention relates to new homogeneous solutions based on polyvinyl chloride, which can be shaped, the process for their preparation and the shaped articles obtained.For a polymer concentration of 15 to 35%, the solutions have an effective viscosity of between 15 and 2,000 poises in a solvent medium which has, at ambient temperature, a solubility parameter of between 8 and 11 and a dielectric constant of between 5 and 25, and which gives, with polyvinyl chloride, a variation in effective viscosity with temperature, represented by a curve d.rho./d.theta., which passes through a maximum absolute value. They are obtained by heating a composition of polyvinyl chloride in the solvent medium to a temperature which is at least 25.degree. C. higher than the average temperature corresponding to the maximum of the curve d.rho./d.theta..
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: July 16, 1985
    Assignee: Rhovyl
    Inventors: Georges Achard, Jacques Menault, Roger Thouvenot