Patents by Inventor Mechthild Zander

Mechthild Zander 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).

  • Mixture of homologue anhydrides of tetra-hydrophthalic anhydride and the process for obtaining same
    Patent number: 3976590
    Abstract: A mixture of anhydrides homologous to tetra-hydrophthalic anhydride, having a melting point between 40.degree. and 50.degree.C. and comprising from 30 to 50 % of endo-methylene-tetrahydrophthalic anhydride, from 30 to 45 % of methyl-4-tetrahydrophthalic anhydride and from 10 to 25 % of methyl-3-tetrahydrophthalic anhydride and is obtained by the reaction in counter-flow of maleic anhydride with a petro-chemical C5 fraction, containing cyclopentadiene, isoprene and piperylene in substantially the same amount, together with other unsaturated C5 hydrocarbon fractions, selected from the group comprising the fractions derived from steam-cracking and pyrolysis of naphtha, the control of the conditions of temperature and flow-rate in order to have an essentially complete reaction, and the recovery of the resulting mixture of anhydrides.
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: August 24, 1976
    Inventors: Emile Yax, Mechthild Zander