Patents by Inventor Heinrich Pohlmann

Heinrich Pohlmann 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 preparing liquid low-salt aqueous reactive dyestuff compositions
    Patent number: 4581036
    Abstract: A process is described for separating sodium sulfate from aqueous solutions of certain fiber-reactive dyestuffs, which contain less than 2% by weight of chloride, by cooling down said solution to a temperature between +5.degree. C. and -15.degree. C. In the course of the cooling, the sodium sulfate precipitates in the form of the decahydrate and can be separated off in conventional manner, for example by filtration. The results obtained in this way are aqueous liquid low-salt preparations of these dyestuffs which contain less than 4% by weight of sodium sulfate.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: April 8, 1986
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Konrad Opitz, Heinrich Pohlmann, Manfred Sittig, Christian Fabel, Siegfried Wilhelm, Franz Mitter