Patents by Inventor Burkhard Ort

Burkhard Ort 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 quinophthalones
    Patent number: 5106980
    Abstract: A process for the preparation of a quinophthalone of the formula ##STR1## in which X is hydrogen, chlorine or bromine and n is an integer from 1 to 4, by condensing 8-aminoquinaldine with a phthalic anhydride, optionally monosubstituted or polysubstituted by chlorine or bromine, in the presence of molten benzoic acid acting as diluent.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: April 21, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Burkhard Ort, Guido Kuth
  • Preparation of pyrazolo[5,1-b]quinazolones
    Patent number: 5028705
    Abstract: Pyrazolo[5,1-b]quinazolones are prepared by reacting isatoic anhydrides with pyrazolones at from 100.degree. to 180.degree. C. in an inert organic solvent with simultaneous azeotropic removal of the water formed in the course of the reaction.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: July 2, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Hartmut Kanter, Burkhard Ort
  • Preparation of pyrazolo(5,1-B)quinazolones
    Patent number: 4925946
    Abstract: Pyrazolo[5,1-b]quinazolones are prepared by reacting isatoic anhydrides with 3-methylpyrazol-5-one in water as reaction medium at from 40.degree. to 150.degree. C. under from 1 to 5 bar.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: May 15, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Hartmut Kanter, Burkhard Ort
  • Preparation of haloisatoic anhydrides
    Patent number: 4897478
    Abstract: Haloisatoic anhydrides are prepared by halogenating appropriately unsubstituted isatoic anhydrides with elemental chlorine or bromine in the presence of chlorosulfonic acid at from -10.degree. C. to +100.degree. C. using not less than 0.5 mole of halogen per mole of isatoic anhydride.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: January 30, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Hartmut Kanter, Heinrich Kowarsch, Burkhard Ort