Patents by Inventor Helmut Engelhard

Helmut Engelhard 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).

  • Process for treating cellulosic fibre material
    Patent number: 4629468
    Abstract: The treatment of cellulosic fibre materials before or after dyeing or printing with direct or reactive dyestuffs is carried out with aqueous liquors which contain quaternized polyethers which are obtained by condensation of N-2-hydroxyalkylamines of the formula ##STR1## in which R.sub.1 and R.sub.2, independently of each other, denote hydrogen or a C.sub.1 -C.sub.4 -alkyl radical andR denotes a C.sub.1 -C.sub.18 -alkyl, cycloalkyl, aralkyl or aryl radical or one of the hydroxyalkyl groups ##STR2## with the proviso that the amount of N-2-hydroxyalkylamines in which R stands for a hydroxyalkyl group accounts for no more than 20 percent by weight of the hydroxyalkylamines used,if desired by co-condensation with polyols of the formulaA(OH).sub.n IIin whichA denotes a 2-, 3- or 4-valent aliphatic, cycloaliphatic, araliphatic or aromatic radical andn is a number from 2 to 4,and subsequent quaternization.
    Type: Grant
    Filed: April 18, 1985
    Date of Patent: December 16, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Engelhard, Dieter Feuser, Udo Hendricks, Ergun Tamer
  • Fibre and filament mixtures containing high-shrinkage bifilar poly(mod)acrylic filaments or fibres modified with carbon black
    Patent number: 4248934
    Abstract: The invention relates to fibre or filament mixtures consisting of high shrinkage side-by-side bifilar (mod)acrylic fibres or filaments separately containing TiO.sub.2 and carbon black and of normal fibres or filaments of polyamide, polyester, polyalkylene, poly(mod)acrylic, wool or cotton.
    Type: Grant
    Filed: July 5, 1978
    Date of Patent: February 3, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Martin Wandel, Helmut Engelhard, Ernst Gutschik, Manfred Reichardt, Geert Christoph
  • Polyalkylene oxide-containing urethane polyols with sulphonic acid groups
    Patent number: 4245110
    Abstract: This invention relates to urethanes which contain at least one sulphonic acid group and at least two free OH-groups and to a process for the preparation thereof.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: January 13, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Engelhard, Gerhard D. Wolf, Francis Bentz, Gunther Nischk
  • Dihydroxy carbamates containing sulphonic acid groups
    Patent number: 4166186
    Abstract: The instant invention relates to dihydroxy carbamates containing sulphonic acid groups, and to a process for their production. They are obtained by the addition of bisulphites to unsaturated carbamates.
    Type: Grant
    Filed: March 4, 1975
    Date of Patent: August 28, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard D. Wolf, Helmut Engelhard, Francis Bentz, Gunther Nischk