Patents by Inventor Sigmar-Peter von Halasz

Sigmar-Peter von Halasz 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).

  • Copolymers of ethylenically unsaturated carboxylic acid esters with polyoxyalkylene ethers of lower, unsaturated alcohols as flow-improving agents for paraffin containing oils
    Patent number: 5718821
    Abstract: The invention relates to novel copolymers of ethylenically unsaturated carboxylic acid esters with polyoxyalkylene ethers of lower, unsaturated alcohols, their preparation, their use as flow-improving agents for paraffin-containing oils, and oils which contain such copolymers.The invention also relates to the use of known copolymers of ethylenically unsaturated carboxylic acid esters with polyoxyalkylene ethers of allyl and/or methallyl alcohol as flow-improving agents for paraffin-containing oils.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: February 17, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Matthias Krull, Sigmar-Peter von Halasz, Werner Reimann, Juliane Balzer, Horst Geiss
  • 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
  • Aqueous surfactant mixtures, and the use thereof in the recovery of crude oil
    Patent number: 4970007
    Abstract: Surfactant mixtures made from 5 to 80% by weight of an ether sulfonate, 5 to 80% by weight of an alkyl or alkylphenol polyglycol ether and 10 to 80% by weight of an alkanesulfonate, petroleumsulfonate or alkylbenzenesulfonate. This combination of surfactants produces stable, aqueous solutions or dispersions which are highly suitable for surfactant flooding in tertiary oil recovery since these aqueous surfactant solutions or dispersions form microemulsions with the oil even at high salinities.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: November 13, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dennis Miller, Manfred Schmidt, Arno Holst, Sigmar-Peter von Halasz
  • 2,3-Dichloro-2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane and process for its manufacture
    Patent number: 4324930
    Abstract: The compound 2,3-dichloro-2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane is obtained by chlorinating perfluoro(2-methyl-2-pentene) with elementary chlorine in the presence of light rich in energy. This compound is distinguished by a high thermal and chemical stability.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: April 13, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Sigmar-Peter von Halasz
  • Process for preparing perfluorinated ethers
    Patent number: 3985810
    Abstract: Perfluorinated ethers containing carboxylic acid fluoride groups and optionally units derived from hexafluoropropene epoxide or tetrafluoroethylene epoxide are reacted with fluorine at temperatures of from 50.degree. to 350.degree.C in the presence of metallic catalysts. During the reaction carbonyl difluoride is splitt off and an ether is obtained in high yield which is free of carboxylic acid fluoride groups. Metallic silver is well suited as catalyst.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: October 12, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Sigmar-Peter von Halasz, Friedhelm Kluge
  • Process for preparing perfluorononanes
    Patent number: 3962358
    Abstract: By reacting a perfluoro-nonene of the general formula C.sub.9 F.sub.18 in the liquid phase with elementary fluorine a perfluorononane of the general formula C.sub.9 F.sub.20 is formed at high yield.
    Type: Grant
    Filed: June 20, 1974
    Date of Patent: June 8, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Sigmar-Peter von Halasz