Patents by Inventor Marcel Vingerhoets

Marcel Vingerhoets 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).

  • Aqueous solutions of sodium salts of trimercapto-s-triazine, their preparation and use
    Patent number: 5258515
    Abstract: The invention relates to aqueous solutions of sodium salts of trimercapto-s-triazine whose molar saturation concentration at 0.degree. C. to 40.degree. C. is above the saturation concentration of trimercapto-s-triazine trisodium salt (TMT-Na.sub.3). More than two but less than three hydrogen atoms of the trimercapto-s-triazine are replaced by sodium ions. The solutions preferably contain trimercapto-s-triazine disodium salt (TMT-Na.sub.2) in addition to a little TMT-Na.sub.3. Surprisingly, the water solubility of TMT-Na.sub.2 is greater than that of TMT-Na.sub.3. The solutions represent a suitable supply form for the active substance trimercapto-s-triazine (TMT-H.sub.3) used in the separation of heavy metals The preparation takes place by means of reacting TMT-Na.sub.3 with TMT-H.sub.3 in a molar ratio of 1:greater than 0-less than 0.5, especially 1:0.1 to 1:<0.5 in aqueous solution.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: November 2, 1993
    Assignee: Degussa Aktiengesellschaft
    Inventors: Klaus Hentschel, Marc Samson, Marcel Vingerhoets, Karl-Ludwig Weber
  • Disodium salt of trimercapto-s-triazine hexahydrate, and method of its preparation
    Patent number: 5075444
    Abstract: The disodium salt of trimercapto-s-triazine hexahydrate (TMT-Na.sub.2.6H.sub.2 O) which has a considerably higher water solubility than previously known TMT sodium salts. It is used for separating heavy metals from aqueous phase, especially from waste water.TMT-Na.sub.2.6H.sub.2 O is prepared by reacting TMT-Na.sub.3 .9H.sub.2 O, available from cyanuric chloride, with trimercapto-s-triazine (TMT-Ha.sub.3) in a molar ratio of 2-2.1 to 1 in aqueous medium with subsequent crystallization of the TMT-Na.sub.2 .6H.sub.2 O.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: December 24, 1991
    Assignee: Degussa AG
    Inventors: Klaus Hentschel, Marc Samson, Marcel Vingerhoets, Karl-Ludwig Weber
  • Method of preparing trisodium 2,4,6-mercapto-s-triazine nonahydrate
    Patent number: 5006654
    Abstract: The trisodium salt of 2,4,6-trimercapto-s-triazine nonahydrate (TMT-Na.sub.3 9H.sub.2 O) is prepared by reacting cyanuric chloride with NaHS and NaOH or with a mixture of NaHS and Na.sub.2 S and NaOH in an alkaline, aqueous medium.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: April 9, 1991
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karl Ludwig, Edwin van Raemdonck, Klaus Stutzel, Marcel Vingerhoets
  • Trisodium salt of 2,4,6-trisodium mercapto-s-triazine monohydrate and method for its preparation
    Patent number: 4849517
    Abstract: The trisodium salt of 2,4,6-trimercapto-s-triazine non-ahydrate (TMT-Na.sub.3 9H.sub.2 O) is prepared by reacting cyanuric chloride with NaHS and NaOH or with amixture of NaHS and Na.sub.2 S and NaOH in an alkaline, aqueous medium.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: July 18, 1989
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karl L. Weber, Edwin van Raemdonck, Klaus Stutzel, Marcel Vingerhoets