Patents by Inventor Detlef Wendisch

Detlef Wendisch 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).

  • Pure annonin and a process for the preparation thereof
    Patent number: 4762716
    Abstract: Annonin, a substantially pure insecticidally active compound obtained by extracting comminuted Annona squamosa parts to remove the petroleum ether solubles, then optionally extracting with alcohol to dissolve the desired material, then extracting either the petroleum ether-residue or the alcohol extract with an aliphatic halogenohydrocarbon, an aliphatic ether and/or an ester, and discarding the residue, and evaporating off the solvent. It has the 1R spectrum shown in the drawing.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: August 9, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich F. Moeschler, Wolfgang Pfluger, Detlef Wendisch
  • Pure annonin and a process for the preparation thereof
    Patent number: 4689232
    Abstract: Annonin, a substantially pure insecticidally active compound obtained by extracting comminuted Annona squamosa parts to remove the petroleum ether solubles, then optionally extracting with alcohol to dissolve the desired material, then extracting either the petroleum ether-residue or the alcohol extract with an aliphatic halogenohydrocarbon, an aliphatic ether and/or an ester, and discarding the residue, and evaporating off the solvent. It has the 1R spectrum shown in the drawing.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: August 25, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinrich F. Moeschler, Wolfgang Pfluger, Detlef Wendisch
  • Hydroxy alkane sulfonic acid sulfoalkyl esters
    Patent number: 4483799
    Abstract: Sulfoalkylating agents free from sultones may be obtained by heating hydroxy alkane sulfonic acids of propane or butane or the corresponding sultones having 5 or 6 ring members with up to four times the molar quantity of water to a temperature in the region of from 80.degree. to 180.degree. C. The sulfoalkylating agents are believed to be the "dimeric esters" of the hydroxy alkane sulfonic acids.
    Type: Grant
    Filed: February 2, 1981
    Date of Patent: November 20, 1984
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Helmut Kampfer, Detlef Wendisch, Marie Hase