Patents by Inventor Herbert Wirtz

Herbert Wirtz 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).

  • New copolymers, mixtures thereof with poly(meth)acrylate esters and the use thereof for improving the cold fluidity of crude oils
    Patent number: 5349019
    Abstract: New copolymers, mixtures thereof with poly(meth)acrylate esters and the use thereof for improving the cold fluidity of crude oils.Copolymers comprising as comonomers therein from 50 to 99.9% by weight of a C.sub.14 -C.sub.22 -alkyl(meth)acrylate and 50 to 0.1% by weight of a comonomer derived from a compound comprising a single polymerizable C.dbd.C group and these copolymers or their mixture with C.sub.14 -C.sub.22 -alkyl poly(meth)acrylates having enhanced pour point depressant properties.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: September 20, 1994
    Assignee: Hoechst
    Inventors: Herbert Wirtz, Sigmar-Peter von Halasz, Michael Feustel, Juliane Balzer
  • Process for the preparation of 2-substituted 1-(acylaminoalkyl)-2-imidazolines
    Patent number: 5041553
    Abstract: In the process for the preparation of 2-substituted 1-(acylaminoalkyl)-2-imidazolines of the general formula I ##STR1## wherein R denotes an alkylene radical and R.sup.1 denotes a fatty acid radical, for example, a fatty acid and a dialkylenetriamine are reacted in a molar ratio of (1.9 to 2.0): 1 in such a way that the dialkylenetriamine is initially introduced hot under an inert gas atmosphere and the fatty acid is metered in hot and the amido amine formation is subsequently completed by heating to temperatures from 140.degree. to 190.degree. C. and the cyclization to the compound of the formula I is subsequently carried out at an under-pressure of at least 50 mbar.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: August 20, 1991
    Assignee: Cassella Aktiengesellschaft
    Inventors: Karl-Heinz Keil, Georg-Wolfgang Eckardt, Herbert Wirtz, Helmut Berenbold, Werner Wellbrock, Horst Frohlich
  • Esters of fatty acids, which may be quaternized, from oxalkylated alkylalkylenediamines
    Patent number: 4997912
    Abstract: Fatty acid esters of oxalkylated alkylalkylenediamines, which may be quaternized:Esters of oxalkylated alkylalkylenediamines, which may be quaternized, of the formula ##STR1## where the individual symbols have the meaning given in the description, process for their production and their use as corrosion inhibitors, particularly in crude oil recovery plants and crude oil treatment plants.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: March 5, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Wirtz, Hermann Hoffmann, Werner Ritschel, Manfred Hofinger, Michael Mitzlaff, Dietrich Wolter
  • Polymer mixtures for improving the low-temperature flow properties of mineral oil distillates
    Patent number: 4985048
    Abstract: Polymer mixtures of a copolymer (A.sub.1) made from 10-60% by weight of vinyl acetate and 40-90% by weight of ethylene or a copolymer (A.sub.2) made from 15-50% by weight of vinyl acetate, 0.5-20% by weight of C.sub.6 -C.sub.24 -.alpha.-olefin and 30-70% by weight of ethylene, and a copolymer (B) made from 10-90% by weight of C.sub.6 -C.sub.24 -.alpha.-olefin and 10-90% by weight of N-C.sub.6 -C.sub.12 -alkylmaleiimide, the mixing ratio of copolymers (A.sub.1) or (A.sub.2) to (B) being 100:1 to 1:1. These polymer mixtures are employed as flow improvers in mineral oil distillates.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: January 15, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Wirtz, Michael Feustel, Juliane Balzer