Patents by Inventor Franz-Thomas Schwarz

Franz-Thomas Schwarz 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 pure 4,6-dihloropyrimidine
    Patent number: 5723612
    Abstract: Process for the preparation of pure 4,6-dichloropyrimidine by reaction of 4,6-dihydroxypyrimidine with an excess of phosphorus oxychloride at 20.degree. C. up to reflux temperature, in the presence of a trialkylamine as acid scavenger and catalyst.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: March 3, 1998
    Assignee: DSM Chemie Linz GmbH
    Inventors: Wolfgang Huber, Franz Thomas Schwarz, Ferdinand Heu
  • Process for the production of 2,5-dianilino-terephthalic acids
    Patent number: 5659076
    Abstract: A process for the transesterification of dimethyl succinylsuccinate with one or more aliphatic alcohols which in each case have at least 2 C atoms, in the presence of an acidic catalyst and in the presence or absence of a diluent which is inert under the reaction conditions, with exclusion of oxygen and under pressure, at least one of the two methoxy groups being replaced by the oxy group corresponding to the alcohol used and use of the process in a process for the preparation of terephthalic acids and of quinacridones.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: August 19, 1997
    Assignee: DSM Chemie Linz GmbH
    Inventors: Franz Thomas Schwarz, Johann Altreiter, Franz Mostl
  • Process for the preparation of 2-amino-4,6-dichloro-pyrimidine
    Patent number: 5563270
    Abstract: Process for the preparation of 2-amino-4,6-dichloropyrimidine by reaction of 2-amino-4,6-dihydroxypyrimidine with an excess of phosphorus oxychloride at 20 to 80.degree. C. and in the presence of triethylamine as the acid-trapping agent.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: October 8, 1996
    Assignee: DSM Chemie Linz GmbH
    Inventors: Franz-Thomas Schwarz, Johann Altreiter