Patents by Inventor Peter Ziemek

Peter Ziemek 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 organic polyisocyanates containing urea groups
    Patent number: 4292255
    Abstract: The present invention relates to a process for the preparation of compounds selected from the group consisting of a polyisocyanate containing urea groups and a polyisocyanate containing biuret groups comprising(a) introducing an organic polyisocyanate into a reaction vessel, and(b) injecting an organic polyamine containing at least two primary amino groups into the organic polyisocyanate in the reaction vessel at a pressure of from about 2 to 1000 bar through a straight jet nozzle having an internal diameter of from about 0.01 to 5 mmwherein(i) the polyisocyanate/polyamine NCO/NH.sub.2 molar ratio is at least about 4:1 and(ii) the temperature in the reaction vessel is between about -20.degree. C. to 250.degree. C.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: September 29, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans J. Hennig, Peter Ziemek, Erhard Schellmann
  • Process for the preparation of organic polyisocyanates containing biuret groups
    Patent number: 4264519
    Abstract: The present invention relates to a process for the preparation of compounds selected from the group consisting of a polyisocyanate containing urea groups and a polyisocyanate containing biuret groups comprising(a) introducing an organic polyisocyanate into a reaction vessel, and(b) injecting an organic polyamine containing at least two primary amino groups into the organic polyisocyanate in the reaction vessel at a pressure of from about 2 to 1000 bar through a straight jet nozzle having an internal diameter of from about 0.01 to 5 mmwherein(i) the polyisocyanate/polyamine NCO/NH.sub.2 molar ratio is at least about 4:1 and(ii) the temperature in the reaction vessel is between about -20.degree. C. to 250.degree. C.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: April 28, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans J. Hennig, Peter Ziemek, Erhard Schellmann
  • Process for converting polyaminopolyaryl-methanes into diaminodiarylmethanes
    Patent number: 4089901
    Abstract: Polyaminopolyarylmethanes and a monoarylamine are heated in water in the presence of a solid acid catalyst insoluble in the reaction mixture to convert the polyarylaminopolyarylmethanes into diaminodiarylmethanes.
    Type: Grant
    Filed: February 12, 1974
    Date of Patent: May 16, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Ziemek, Roderich Raue, Hans-Josef Buysch
  • Process for converting polyaminopolyaryl-methanes into diaminodiarylmethanes
    Patent number: 4083870
    Abstract: Polyaminopolyarylmethanes and an aromatic monoamine unsubstituted in an ortho or a para position to the amino group are heated in water to produce diaminodiarylmethanes.
    Type: Grant
    Filed: February 12, 1974
    Date of Patent: April 11, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Josef Buysch, Peter Ziemek, Roderich Raue
  • Process for the preparation of heterocyclic compounds
    Patent number: 3981869
    Abstract: Process for the preparation of heterocyclic compounds of the general formula ##SPC1##By condensation of an o-substituted amine of the general formula ##SPC2##With a carbonyl compound of the general formula ##EQU1## in the presence of a hydrazine of the general formula ##EQU2## followed by quaternization if appropriate. In the formulae the radicals have the meaning as indicated below.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: September 21, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventor: Peter Ziemek