Patents by Inventor Karl-Heinrich Lange

Karl-Heinrich Lange 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 dyestuffs
    Patent number: 5578711
    Abstract: Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component andK is the radical of an aromatic or heterocyclic coupling component, or is the radical of an active methylene compound,are obtained in an ecologically advantageous manner by reacting an aromatic or heterocyclic diazo components of the formulaD--NH.sub.2and a coupling component of the formulaH--Kwith a nitrite, for example NaNO.sub.2, in the presence of CO.sub.2 at a pressure of 5-100 at. The process is suitable in particular for the preparation of concentrated dye-stuff solutions, because expensive operations, such as, for example, pressure permeation and reverse osmosis, can be omitted.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: November 26, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roderich Raue, Alfred Brack, Karl-Heinrich Lange
  • Process for the preparation of dyestuffs
    Patent number: 5541299
    Abstract: Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component andK is the radical of an aromatic or heterocyclic coupling component, or is the radical of an active methylene compound,are obtained in an ecologically advantageous manner by reacting an aromatic or heterocyclic diazo components of the formulaD--NH.sub.2and a coupling component of the formulaH--Kwith a nitrite, for example NaNO.sub.2, in the presence of CO.sub.2 at a pressure of 5-100 at. The process is suitable in particular for the preparation of concentrated dye-stuff solutions, because expensive operations, such as, for example, pressure permeation and reverse osmosis, can be omitted.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: July 30, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roderich Raue, Alfred Brack, Karl-Heinrich Lange
  • Process for the preparation of dyestuffs
    Patent number: 5502171
    Abstract: Dyestuffs of the formula ##STR1## in which D is the radical of an aromatic or heterocyclic diazo component andZ is the radical of an aromatic or heterocyclic coupling component,are obtained in an ecologically advantageous manner by reacting an aromatic or heterocyclic diazo components of the formulaD--NH.sub.2and a coupling component of the formulaH--Z.sub.1with a nitrite, in the presence of CO.sub.2 at a pressure of 5-100 at. The process is suitable in particular for the preparation of concentrated dyestuff solutions, because expensive operations, such as, for example, pressure permeation and reverse osmosis, can be omitted.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: March 26, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roderich Raue, Alfred Brack, Karl-Heinrich Lange
  • Cationic 1,3,4-thiadiazole dyestuffs
    Patent number: 5436323
    Abstract: Cationic 1,3,4-thiadiazolyldiphenylamine dyestuffs and corresponding anhydro bases, the dyestuffs having the formula (I) ##STR1## their preparation and their use, and materials dyed with such dyestuffs.
    Type: Grant
    Filed: July 1, 1993
    Date of Patent: July 25, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Horst Berneth, Werner Hartwich, Karl-Heinrich Lange
  • Cationic triazatrimethine dyestuffs
    Patent number: 5328993
    Abstract: The new cationic triazatrimethine dyestuffs of the formula ##STR1## wherein the substituents B, Z, R.sup.2 and An.sup..crclbar. have the meaning given in the description, are suitable for dyeing and printing naturally occurring and synthetic materials.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: July 12, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hauke Furstenwerth, Karl-Heinrich Lange, Roderich Raue, Alfred Brack