Patents by Inventor Marcel Durant

Marcel Durant 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).

  • Process for the preparation of monolithic silica aerogels
    Patent number: 5795557
    Abstract: A process for the preparation of a silica aerogel that includes subjecting a mixture that includes an organosilicon compound and ethyl acetoacetate to hydrolysis and polycondensation in an acidic medium to obtain a transparent gel. The organic solvent is substituted by liquid carbon dioxide and the carbon dioxide is evacuated under supercritical conditions of the carbon dioxide to obtain an aerogel.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: August 18, 1998
    Assignees: Universite Claude Bernard, Produits Chimiques Auxiliares, Armienes, Centre Scientifique et Technque Du Batiment
    Inventors: Gerard Pajonk, Elimame Elaloui, Redouane Begag, Marcel Durant, Bruno Chevalier, Jean-Luc Chevalier, Patrick Achard
  • Liquid precursor for the production of fluorine doped tin oxide coatings and corresponding coating process
    Patent number: 5417757
    Abstract: A liquid precursor for the production of fluorine doped tin oxide coatings including 60 to 90% by weight of at least one chlorinated organotin derivative, 5 to 30% by weight of at least one organotin mono(fluoroalkanoate), and 0 to 15% by weight of a tetraorganotin compound. Using vapor phase deposition, this produces a coating with low surface resistance and a high light transmission coefficient. Deposition is effected quickly so the precursor can readily be used to coat a moving substrate, for example, float glass.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: May 23, 1995
    Assignee: Produits Chimiques Auxiliaires Et De Synthese, (P.C.A.S.) (S.A.)
    Inventors: Gilles Merienne, Dominique Valette, Marcel Durant
  • Concentrated aqueous solutions of cationic colorant and procedure for their preparation
    Patent number: 4264496
    Abstract: The present invention provides concentrated aqueous acid solutions of the colorant having the formula: ##STR1## in which A.sup..crclbar. represents the formate, acetate or propionate anion. The solutions are prepared starting with the corresponding chloride or sulfomethylate by forming the m- or p-nitrobenzoate, dissolving said salt in formic, acetic or propionic acid and eliminating the nitrobenzoic acid which is precipitated. The solutions of the invention can be used for coloring and printing fibers containing acid groups, and particularly acrylic fibers.
    Type: Grant
    Filed: November 15, 1979
    Date of Patent: April 28, 1981
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventor: Marcel Durant