Patents by Inventor Siegfried Kersten

Siegfried Kersten 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).

  • Crystalline form and its preparation
    Patent number: 4931466
    Abstract: A compound of the chemical formula (I) ##STR1## in a specific crystalline form, processes for its preparation, and its use for pest control.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: June 5, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Siegfried Kersten, Karl-Friedrich Jaeger, Karl-Heinz Koenig, Albrecht Mueller, Josef B. Pawliczek, Hans-Gert Recker, Wolfgang Rohr, August Wigger
  • O-(O-ethyl-S-alkylphosphoryl)-O-(carbamyl)-pyrocatechol derivatives
    Patent number: 4855140
    Abstract: O-(O-ethyl-S-alkylphosphoryl)-O-(carbamoyl)-pyrocatechol derivatives of the formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, R.sup.2 is hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, R.sup.3 is hydrogen or C.sub.1 -C.sub.4 -alkyl, and X is oxygen or sulfur, and methods of combating pests with effective amounts of I.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: August 8, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Wolfgang Seppelt, Linhard Sproesser, Siegfried Kersten, Peter Hofmeister, Christoph Kuenast
  • Preparation of o-(1-methoxy-2-chloro)-ethoxyphenyl N-methylcarbamate
    Patent number: 4788324
    Abstract: O-(1-Methoxy-2-chloro)ethoxyphenyl N-methylcarbamate is prepared by reacting pyrocatechol carbonate with methylamine and then reacting the resulting pyrocatechol monomethylcarbamate with 1,2-dichloroethyl methyl ether in the presence of a secondary amine.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: November 29, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Gernot Reissenweber, Siegfried Kersten, Detlef Doehnert
  • Preparation of pyrocatechol methylcarbamate
    Patent number: 4537986
    Abstract: Pyrocatechol methylcarbamate is prepared by reacting pyrocatechol carbonate with methylamine in the presence of a tertiary amine and, preferably, a solvent.
    Type: Grant
    Filed: July 27, 1983
    Date of Patent: August 27, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Gernot Reissenweber, Siegfried Kersten, Walter Ditter, Peter Jacobs
  • Vinyl-substituted sulfamic acid halides
    Patent number: 4049709
    Abstract: New sulfamic acid halides and a process for the manufacture of sulfamic acid halides by reacting sulfamic acids with aldehydes and acid halides. The products are starting materials for the manufacture of crop protection agents, dyes and pharmaceuticals.
    Type: Grant
    Filed: October 22, 1976
    Date of Patent: September 20, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Hamprecht, Siegfried Kersten
  • Manufacture of aliphatic isocyanates
    Patent number: 4003938
    Abstract: Aliphatic isocyanates are produced by thermal decomposition of the corresponding .beta.-naphthyl carbamates.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: January 18, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Koenig, Siegfried Kersten, Christian Reitel