Patents by Inventor Gert Volkwein

Gert Volkwein 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 4-phenoxyphenols
    Patent number: 4355189
    Abstract: Process for the preparation of 4-phenoxyphenols of the formula ##STR1## in which R.sup.1 through R.sup.5 are hydrogen, halogen or alkyl, by diazotization of amines of the formula ##STR2## in a hydrochloric acid medium, and boiling in aqueous sulfuric acid at 110.degree. to 150.degree. C.
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: October 19, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gert Volkwein, Hubert Schonowsky, Konrad Baessler
  • Process for the manufacture of 1,3,5-trichlorobenzene
    Patent number: 4306103
    Abstract: 1,3,5-trichlorobenzene is manufactured by treating 5-chloro-1,3-dinitrobenzene and/or 3,5-dichloronitrobenzene with chlorine, at a temperature from about 200.degree. to 270.degree. C., preferably from about 230.degree. to 250.degree. C. The resulting process product is an intermediate, for example in plant protection.
    Type: Grant
    Filed: May 16, 1980
    Date of Patent: December 15, 1981
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gert Volkwein, Konrad Baessler, Hans Wolfram
  • Process for the preparation of 2,4-dinitroaniline
    Patent number: 4102927
    Abstract: 2,4-DINITROANILINE IS OBTAINED IN HIGH YIELD AND QUALITY IN A SAFE REACTION BY INTRODUCING 4-CHLORO-1,3-DINITROBENZENE INTO AT LEAST THREE-FOLD STOICHIOMETRIC AMOUNT OF AQUEOUS AMMONIA OF A CONCENTRATION OF 15 TO 40% BY WEIGHT AT A TEMPERATURE OF 60.degree. TO 90.degree. C.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: July 25, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gert Volkwein, Konrad Baessler