Patents by Inventor Stephan Kwiatkowski

Stephan Kwiatkowski 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).

  • Method of synthesizing flosequinan from 4-fluoroanthranilic acid
    Patent number: 6307050
    Abstract: A high-yield, 4-step synthesis for flosequinan starting with 4-fluoroanthranilic acid comprising cyclization with phosgene to create an intermediate -A, followed by methylation to create an intermediate -B, then by reaction with dimsyl sodium to create an intermediate -C, then by reaction with triethyl orthoformate in the presence of piperdine and acetic acid to give flosequinan. The overall yield of the disclosed process is greater than about 16%.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: October 23, 2001
    Assignee: R. T. Alamo Venture I LLC
    Inventors: Stephan Kwiatkowski, Maya Siddidqui, Rodney Eisenberg, Sudarsan Mukhopadhyay, Lowell Jeffry Lawrence, Steven G. Mobley
  • Process for removing N-nitroso compounds from organo-amine compositions including dinitroaniline herbicides
    Patent number: 6018079
    Abstract: A simple and inexpensive process is described for reducing the concentration of N-nitroso-containing compounds in compositions comprising N-nitroso-containing compounds and other desired compounds wherein the N-nitroso-containing compounds thermally decompose at a temperature below the decomposition temperature of the desired compounds. For compositions comprising dinitroaniline herbicides wherein the N-nitroso compound is a N-nitroso derivative of a precursor in the manufacture of the herbicide, for example Flumetralin, N-ethyl-N-(2-chloro-6-fluorobenzyl)-2,6-dinitro-4-trifluoromethylaniline, the process requires heating the mixture to a temperature greater than about 120.degree. C., and holding the composition at that temperature for a time effective to decompose the N-nitroso compound present in the mixture. Volatile decomposition products are advantageously removed from the composition.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: January 25, 2000
    Assignee: SRM Chemical, Ltd, Co.
    Inventors: Lowell J. Lawrence, Stephan Kwiatkowski
  • A2,6-dinitroaniline herbicide
    Patent number: 5770545
    Abstract: This invention relates to pendralin ?2,6-dinitro-N-(1-ethylpropyl)-4-tert-butylaniline!, preemergence and postemergence herbicidal methods and herbicidal compositions employing pendralin.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: June 23, 1998
    Assignee: SRM Chemical, Ltd. Co.
    Inventors: Lowell J. Lawrence, Terry L. Johnson, Stephan Kwiatkowski, Paul D. Smith