Patents Assigned to Hoechst Aktiegesellschaft
  • Patent number: 5714514
    Abstract: The present invention relates to 2-cyano-3-mercaptocrotonamide derivatives, a process for their preparation, and their use the treatment of immune disorders, carcinomatous disorders, rejection reactions in transplantations and skin disorders or allergy.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: February 3, 1998
    Assignee: Hoechst Aktiegesellschaft
    Inventors: Friedrich-Johannes Kammerer, Rudolf Schleyerbach, Werner Thorwart
  • Patent number: 5024825
    Abstract: For the preparation of dicalcium phosphate dihydrate stabilized with dimagnesium phosphate trihydrate and sodium pyrophosphate, an aqueous suspension of calcium carbonate is introduced into a reactor and recirculated by pumping through a high-speed mixer at 3,500 to 8,000 rpm which is in flow connection with the lower and upper portion of the reactor. Into the mixer an amount of phosphoric acid is introduced which is at least sufficient for the quantitative formation of dicalcium phosphate dihydrate and then an oxygen-containing magnesium compound is introduced into the reactor. Finally, lime milk is metered into the reactor up to a maximum pH of 6.9, before the sodium pyrophosphate is added to the reactor. The resulting suspension which has a stabilized dicalcium phosphate dihydrate content of 20 to 33% by weight is spray-dried.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: June 18, 1991
    Assignee: Hoechst Aktiegesellschaft
    Inventors: Horst Buhl, Josef Holz, Franz-Josef Dany
  • Patent number: 4788278
    Abstract: The invention relates to modified polymers based on polyvinylene carbonate and/or polyhydroxymethylene, the modification being effected by particular alkoxylated compounds incorporated into the polymer. These polymers, for the preparation of which, according to the invention, particular dispersion stabilizers are used, are suitable, inter alia, as carriers for biologically active substances or for affinity chromatography.
    Type: Grant
    Filed: January 9, 1987
    Date of Patent: November 29, 1988
    Assignee: Hoechst Aktiegesellschaft
    Inventor: Otto Mauz