Patents by Inventor Siegfried Dengler

Siegfried Dengler 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).

  • Novel naphthoylene-perinones disperse dyestuffs
    Patent number: 4210757
    Abstract: Dyestuffs of the formula (I) ##STR1## wherein F represents a ring system with at least 3 rings which are angularly condensed with one another, n is 1, 2 or 3, and R, R.sub.1 and R.sub.2 represent optionally substituted alkyl groups which can be interrupted by heteroatoms and also represent cycloalkyl, aralkyl, aryl or heterocyclic radicals, R and R.sub.1 can also represent hydrogen atoms, R.sub.1 and R.sub.2, together with the nitrogen atom, are able to form a ring with 5 or 6 members, and R and R.sub.2 can combine to form a nitrogen-containing heterocycle.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: July 1, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Siegfried Dengler, Peter Loew, Christian Zickendraht, Hansrudolf Schwander
  • Disperse dyestuffs
    Patent number: 4067889
    Abstract: Dyestuffs of the formula (I) ##STR1## wherein F represents a ring system with at least 3 rings which are angularly condensed with one another, n is 1, 2 or 3, and R, R.sub.1 and R.sub.2 represent optionally substituted alkyl groups which can be interrupted by heteroatoms and also represent cycloalkyl, aralkyl, aryl or heterocyclic radicals, R and R.sub.1 can also represent hydrogen atoms, R.sub.1 and R.sub.2, together with the nitrogen atom, are able to form a ring with 5 or 6 members, and R and R.sub.2 can combine to form a nitrogen-containing heterocycle.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: January 10, 1978
    Assignee: Ciba-Geigy Corporation
    Inventors: Siegfried Dengler, Peter Loew, Christian Zickendraht, Hansrudolf Schwander
  • Coumarine dyestuffs of the dispersion series
    Patent number: 4002619
    Abstract: Dyestuffs of the formula ##STR1## wherein R, R.sub.1, and R.sub.2 represent optionally substituted alkyl groups that can be interrupted by heteroatoms, and also represent cycloalkyl, aralkyl, aryl, or heterocyclic radicals, R and R.sub.1 can also be hydrogen atoms, R.sub.1 and R.sub.2, together with the nitrogen atom, are able to form a 5-membered or 6-membered ring, R and R.sub.2 are able to combine to form a nitrogen-containing heterocycle, B is =O or =NH, and A represents a heterocycle. The new dyestuffs dye synthetic fibers, especially polyester fibers, in greenish yellow shades.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: January 11, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Siegfried Dengler, Peter Loew, Christian Zickendraht, Hansrudolf Schwander
  • Disperse dyestuffs
    Patent number: 3970675
    Abstract: Dyestuffs of the formula (I) ##EQU1## WHEREIN F represents a ring system with at least 3 rings which are angularly condensed with one another, n is 1, 2 or 3, and R, R.sub.1 and R.sub.2 represent optionally substituted alkyl groups which can be interrupted by heteroatoms and also represent cycloalkyl, aralykyl, aryl or heterocyclic radicals, R and R.sub.1 can also represent hydrogen atoms, R.sub.1 and R.sub.2, together with the nitrogen atom, are able to form a ring with 5 or 6 members, and R and R.sub.2 can combine to form a nitrogen-containing heterocycle.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: July 20, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Siegfried Dengler, Peter Loew, Christian Zickendraht, Hansrudolf Schwander