Patents by Inventor Jochem Henkelmann

Jochem Henkelmann 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).

  • Preparation of alkyl-substituted aromatic ketones
    Patent number: 4853481
    Abstract: Alkyl-substituted aromatic ketones are prepared by reacting alkylbenzenes with carboxylic anhydrides in the presence of a Friedel-Crafts catalyst by performing the reaction in the presence of a tertiary amine or diamine.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: August 1, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Jochem Henkelmann, Manfred Eggersdorfer, Walter Grosch, Alfred Schuhmacher, Hardo Siegel
  • Preparation of polyaryl ether ketones
    Patent number: 4837296
    Abstract: Polyaryl ether ketones are prepared by reacting aromatic dihydroxy compounds with aromatic dihalogen compounds in polar aprotic solvents in the presence of alkali metal carbonates, in particular by reacting aromatic dihydroxy compounds I ##STR1## or ring-substituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy, aryl, chlorine or fluorine derivatives thereof, n and m each being 0 or 1, with aromatic dihalogen compounds ##STR2## or ring-substituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy, aryl, chlorine or fluorine derivatives thereof, r and s each being 0 or 1, A being oxygen or a chemical bond and X being chlorine or fluorine.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: June 6, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerhard Heinz, Juergen Koch, Manfred Eggersdorfer, Jochem Henkelmann
  • Aryl ether ketones
    Patent number: 4835242
    Abstract: Aryl ether ketones of the general formula I ##STR1## where n is from 0 to 5,X is ##STR2## and Y is tert-butyl, acetyl, benzyl, benzoyl, tert-butoxycarbonyl or, in the case of n=0, H,and the ring-substituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy, aryl, chlorine or fluorine derivatives thereof are useful for preparing highly heat-resistant polyaryl ether ketones.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: May 30, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Eggersdorfer, Jochem Henkelmann, Gerhard Heinz, Juergen Koch