Patents by Inventor Geertrudes H. Suverkropp

Geertrudes H. Suverkropp 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 dicarboxylic acids
    Patent number: 5917049
    Abstract: Process for the preparation of a heterocyclic o-dicarboxylic acid containing at least one N atom, in which a corresponding benzo-fused heterocyclic compound containing at least one N atom is oxidised in the presence of hydrogen peroxide, a Bronsted acid and an iron compound.Preferably Fe(NO.sub.3).sub.3 is used as the iron compound and HNO.sub.3 as the Bronsted acid. The amount of iron compound to be used preferably lies between 0.1 and 2 mol. %, relative to the amount of employed benzo-fused heterocyclic compound containing at least one N atom. Even higher yields can be obtained if a copper compound or an organic electron-transferring compound is also used, in addition to the iron compound.In particular, the process according to the invention can be used to prepare 2,3-pyridine dicarboxylic acids from corresponding quinoline compounds.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: June 29, 1999
    Assignee: DSM N.V.
    Inventors: Geertrudes H Suverkropp, Paulus L Alsters, Carina S Snijder, Johannes G De Vries
  • Process for the preparation of substituted glyoxylic acid derivatives
    Patent number: 4417053
    Abstract: A process for preparing substituted glyoxylic acid derivatives by oxidizing with a molecular oxygen containing gas an amide or ester of a hydroxy acid in the presence of a catalytic amount of a cobalt compound.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: November 22, 1983
    Assignee: Stamicarbon B.V.
    Inventors: Antonius Corvers, Cornelis W. van den Broek, Geertrudes H. Suverkropp
  • Process for the preparation of a salt of optically active lysine
    Patent number: 3987092
    Abstract: Lysine is optically resolved by forming a salt with sulphanilic acid and selectively crystallizing one of the antipodes from a supersaturated solution thereof. The salt of lysine and sulphanilic acid is a novel compound.
    Type: Grant
    Filed: October 2, 1969
    Date of Patent: October 19, 1976
    Assignee: Stamicarbon N.V.
    Inventors: Willem K. van der Linden, Geertrudes H. Suverkropp
  • Process for optical resolution of racemic lysine sulphanilate
    Patent number: 3932491
    Abstract: Optical resolution of lysine in the form of racemic lysine sulphanilate is enhanced by the addition to the supersaturated solution of racemic lysine sulphanilate of one or more substances which suppress the formation of seeds of racemic lysine sulphanilate in the supersatured solution. Among the seed-suppressing substances which may be added are lysine, lysine acetate, lysine carbonate, amino acetic acid and glycerol. The yield of optically active lysine sulphanilate is improved according to the disclosed process.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: January 13, 1976
    Assignee: Stamicarbon B.V.
    Inventor: Geertrudes H. Suverkropp