Patents by Inventor Ekkehard Wienhoefer

Ekkehard Wienhoefer 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 specifically adjusted polyalcohol mixtures based on sorbitol
    Patent number: 4861513
    Abstract: A polyalcohol mixture is produced by heating dehydrating a reaction mixture comprising D-sorbitol, L-sorbitol or a mixture thereof in the presence of an acid catalyst. The reaction progress is followed by measuring the optical rotation of the reaction mixture during the reaction. The reaction is stopped when the optical rotation value of the reaction mixture corresponds to the optical rotation value of the desired polyalcohol mixture.
    Type: Grant
    Filed: October 9, 1987
    Date of Patent: August 29, 1989
    Assignee: Huels Aktiengesellschaft
    Inventors: Harald Lueders, Hans-Josef Ratajczak, Ekkehard Wienhoefer
  • Adducts of alcohols and olefin oxides as biodegradable and low-foaming tensides useful in detergents
    Patent number: 4303544
    Abstract: A compound of the formula ##STR1## wherein R is alkyl of 8-22 carbon atoms in the alkyl chain or hydroxyalkyl of 2-22 carbon atoms; and R' and R" each independently is hydrogen or C.sub.1 -C.sub.20 -alkyl provided that R' and R" are not simultaneously hydrogen, and R' and R" in total have 8-20 carbon atoms;andin I, x is 0.5-5 and y is 5-50; andin II, z is freely selectable with the proviso that the sum total of all x for a given z is 0.5-5 and the sum total of all y for a given z is 5-50;and m is 1 or 2.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: December 1, 1981
    Assignee: Chemische Werke Huels, A.G.
    Inventors: Kurt Kosswig, Ekkehard Wienhoefer
  • Adducts of alcohols and olefin oxides, suitable for reducing the interfacial surface tension of oily phases with respect to water
    Patent number: 4302349
    Abstract: Compounds of the following formula are suitable for reducing the interfacial surface tension of oily phases with respect to water: ##STR1## wherein z is 1 or 2,R, for z=1, is alkyl, aralkyl, or alkylaryl of 8-22 carbon atoms in the alkyl chain, or hydroxyalkyl of 2-22 carbon atoms, and, for z=2, is (aryl)alkylene of 4-18 carbon atoms,R' and R" each independently is hydrogen or C.sub.1 -C.sub.20 -alkyl wherein R' and R" are not simultaneously hydrogen and R' and R" together have 8-20 total carbon atoms,x is 10-40 andy is 1.2-5.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: November 24, 1981
    Assignee: Chemische Werke Huls, A.G.
    Inventors: Kurt Kosswig, Ekkehard Wienhoefer