Patents by Inventor Gerard Krempf

Gerard Krempf 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).

  • Patent number: 5393508
    Abstract: Solutions of hydrazine hydrate are vaporized, without any concomitant decomposition thereof, by heating such solutions, in the liquid phase, under conditions as to effect the decompression or volatilization thereof; this process is particularly applicable for the vaporization of that hydrazine hydrate solution contained in the reboiler of a column wherein the hydrolysis of an azine R.sub.1 R.sub.2 C.dbd.N-N.dbd.CR.sub.1 R.sub.2 is carried out, with recovery of hydrazine hydrate at the base of the column and of a ketone, R.sub.1 R.sub.2 C.dbd.O, at the column head.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: February 28, 1995
    Assignee: Atochem
    Inventors: Gerard Krempf, Bertrand Collier, Pierre Tellier, Jean-Pierre Pleuvry
  • Patent number: 5252309
    Abstract: Azines, well suited for hydrolysis into hydrazine, are prepared in high yields by reacting ammonia, aqueous hydrogen peroxide and a carbonyl compound reactant in the presence of a catalytically effective amount of a catalyst medium therefor, i.e., an aqueous solution of ammonium acetate and acetamide or of acetamide and acetic acid, but in the absence of CO.sub.2.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: October 12, 1993
    Assignee: Elf Atochem S.A.
    Inventors: Gerard Krempf, Bertrand Collier, Pierre Tellier, Jean-Pierre Schirmann
  • Patent number: 4883859
    Abstract: In the process of producing hydroxylated polybutadiene from a diene monomer in the presence of hydrogen peroxide and a solvent, wherein the solvent is recovered by distillation for reuse; after separation of the hydroxylated polybutadiene from mixture containing such solvent and reaction impurities, the improvement comprising subjecting said mixture to the action of an alkali metal hydroxide or a hydrazine prior to distillation.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: November 28, 1989
    Assignee: ATOCHEM
    Inventors: Richard Audry, Gerard Krempf, Jackie Perono
  • Patent number: 4283577
    Abstract: This invention relates to the method for making ethylene oxide, characterized by the fact that ethylene oxide in the gaseous state is made to react with anhydrous gaseous hydrochloric acid, with the reaction medium likewise being maintained in the gaseous state during the reaction.
    Type: Grant
    Filed: August 31, 1979
    Date of Patent: August 11, 1981
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventors: William Jequier, Elie Ghenassia, Francois Fine, Gerard Krempf