Patents by Inventor Jan Hempel

Jan Hempel 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).

  • Patent number: 3935258
    Abstract: N-arylurea compounds of the formula ##SPC1##In whichn is 0, 1, 2, 3, 4 or 5,X is halogen or halomethoxy, the X's being identical or different when n is 2 to 5,R.sup.1 is hydrogen, alkyl of from 1 to 4 carbon atoms, hydroxyalkyl of from 1 to 4 carbon atoms or alkenyl of from 2 to 4 carbon atoms, andR.sup.2 is alkyl of from 1 to 4 carbon atoms, hydroxyalkyl of from 1 to 4 carbon atoms or alkenyl of from 2 to 4 carbon atomsAre prepared by reacting an arylcarboxylic acid amide of the general formula ##SPC2##In whichX and n have the meanings stated above, with an alkali metal hypohalite or an alkaline earth metal hypohalite at a temperature of from 0.degree. to 40.degree.C in the presence of water as a diluent, and reacting the resulting aqueous solution with an amine of the general formula ##EQU1## in whichR.sup.1 and R.sup.2 have the meanings stated above, at an elevated temperature, preferably at a temperature of from 30.degree. to 100.degree.C.
    Type: Grant
    Filed: June 1, 1972
    Date of Patent: January 27, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jan Hempel, Erich Klauke