Patents by Inventor Franz Legrand

Franz Legrand 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 production of a composite of metal oxides, composite powders of metal oxides and ceramic materials
    Patent number: 5180693
    Abstract: Process for the production of a composite of metal oxides, according to which a metal alcoholate is hydrolysed in the presence of metal (hydr)oxide particles in order to convert the metal alcoholate into a metal (hydr)oxide gel enveloping the metal (hydr)oxide particles. Powders of a composite of metal oxides obtained by this process and ceramic materials obtained by sintering a powder of this type.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: January 19, 1993
    Assignee: Solvay S.A.
    Inventors: Luc Lerot, Franz Legrand, Joel Bourjot
  • Process for the manufacture of a powder of mixed metal oxides, and mixed metal oxide powders
    Patent number: 5152974
    Abstract: Process for the manufacture of a powder of mixed metal oxides by cohydrolysis of metal alcoholates in the presence of an acidic organic compound and mixed metal oxide powders in which the molar relationships R1 and R2 of a metal oxide to the sum of the metal oxides in the powder and in a particle of the powder are such that ##EQU1## The process applies especially well to powders of zirconia doped with yttrium oxide or other oxides.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: October 6, 1992
    Assignee: Solvay S.A.
    Inventors: Franz Legrand, Luc Lerot, Patricia De Bruycker
  • Process for the manufacture of epoxides
    Patent number: 5086189
    Abstract: Epoxides are manufactured by reacting olefines, such as cyclohexene, isoamylene, alpha-pinene, allyl alcohol, 2,5-dihydrofuran and styrene, with hydrogen peroxide, in a homogeneous liquid reaction mixture containing less than 10% by weight of water, in the presence of a compound of a metal of group 6a, such as selenium dioxide or selenous acid, and of an organic nitrogen-containing base having a pKa of not more than 8, such as pyridine, chloropyridine, collidine, quinoline, isoquinoline or a lutidine.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: February 4, 1992
    Assignee: Interox (Societe Anonyme)
    Inventors: Andre Lecloux, Claude Declerck, Franz Legrand
  • Process for the production of oxides of aromatic tertiary amines
    Patent number: 5082940
    Abstract: Aromatic tertiary amines are oxidized by means of hydrogen peroxide in an inert solvent medium in the presence of a catalyst selected from metal selenium and compounds of selenium.The process is applied to the preparation of oxides of heterocyclic aromatic tertiary amines and oxides of non-heterocyclic tertiary amines, in which the nitrogen atom is substituted by at least 1 aromatic nucleus.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: January 21, 1992
    Assignee: Interox (Societe Anonyme)
    Inventors: Franz Legrand, Andre Lecloux, Paul Deschrijver
  • Process for the manufacture of a powder of mixed metal oxides, and mixed metal oxide powders
    Patent number: 4929436
    Abstract: Process for the manufacture of a powder of mixed metal oxides by cohydrolysis of metal alcoholates in the presence of an acidic organic compound and mixed metal oxide powders in which the molar relationships R.sub.1 and R.sub.2 of a metal oxide to the sum of the metal oxides in the powder and in a particle of the powder are such that ##EQU1## The process applies to powders of zirconia doped with yttrium oxide.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: May 29, 1990
    Assignee: Solvay & Cie (Societe Anonyme)
    Inventors: Franz Legrand, Luc Lerot, Patricia De Bruycker
  • Process for the manufacture of vitreous metal oxides
    Patent number: 4853207
    Abstract: Process for the manufacture of vitreous metal oxides in which a metal alcoholate derived from an alcohol, the pka of which is less than 15.74, is hydrolysed with an aqueous medium, the pH of which is greater than 1.5. The process is applied especially to the manufacture of vitreous zirconium oxide.
    Type: Grant
    Filed: February 19, 1987
    Date of Patent: August 1, 1989
    Assignee: Solvay & Cie (Societe)
    Inventors: Henri Wautier, Franz Legrand, Luc Lerot
  • Process for the preparation of hydroxylamines and products thereby obtained
    Patent number: 4845290
    Abstract: Secondary amines are oxidized with hydrogen peroxide in the presence of a catalyst chosen from derivatives of zinc or cadmium.The process is applied to the preparation of di-substituted N,N-hydroxylamines such as N,N-diethylhydroxylamines and N,N-di-n-propylhydroxylamine.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: July 4, 1989
    Assignee: Interox (Societe Anonyme)
    Inventors: Franz Legrand, Paul Deschrijver
  • Process for the manufacture of a metal oxide powder for ceramic materials and zirconia powder produced by this process
    Patent number: 4830993
    Abstract: Process for the manufacture of a metal oxide powder for ceramic materials by the hydrolysis of a metal alcoholate in the presence of an acidic organic compound.The process applies to the production of metal oxide powders, such as zirconia powders, with a mean particle diameter of between 0.05 and 2 microns.
    Type: Grant
    Filed: January 6, 1987
    Date of Patent: May 16, 1989
    Assignee: Solvay & Cie (Societe Anonyme)
    Inventors: Franz Legrand, Patricia Van den Bossche-De Bruycker, Luc Lerot
  • Process for the manufacture of a powder for ceramic materials, containing at least one metal oxide
    Patent number: 4798710
    Abstract: A metal alcoholate is treated with a quantity of water such that the molar ratio of the quantity of water to the quantity of metal alcoholate is lower than the valency of the metal in the alcoholate.
    Type: Grant
    Filed: September 15, 1987
    Date of Patent: January 17, 1989
    Assignee: Solvay & Cie (Societe Anonyme)
    Inventors: Franz Legrand, Patricia De Bruycker
  • Process for the preparation of 2,2,2-trifluoroethanol
    Patent number: 4542245
    Abstract: 2,2,2-Trifluoroethanol is obtained by catalytic oxidation of 1,1-difluoroethylene.The 2,2,2-trifluoroethanol thus obtained is used as a solvent or as a synthesis intermediate.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: September 17, 1985
    Assignee: SOLVAY & Cie (Societe Anonyme)
    Inventors: Andre Lecloux, Franz Legrand
  • Process for the preparation of carboxyl compounds
    Patent number: 4353832
    Abstract: A process for the production of carboxyl compounds such as caprolactones, in which the corresponding carbonyl compounds are oxidized with hydrogen peroxide in the presence of a catalyst in a substantially anhydrous liquid medium. The water formed by the reaction and any water introduced into the reaction mixture are removed from the reaction mixture.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: October 12, 1982
    Assignee: INTEROX (Societe Anonyme)
    Inventors: Andre Lecloux, Claude Declerck, Franz Legrand