Patents by Inventor Norbert Leppert

Norbert Leppert 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).

  • Brightener mixtures based on bisstyryl compounds
    Patent number: 5695686
    Abstract: Brightener mixtures containing from 75% by weight to 100% by weight, based on the weight of the mixture, of the bisstyryl compounds of the formulae I and II ##STR1## in a weight ratio from 10:90 to 70:30, formulations containing the novel mixtures, and also their use for optically brightening synthetic, semisynthetic or natural polymer materials.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: December 9, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Hauptreif, Norbert Leppert, Karl-Heinz Etzbach, Helmut Reichelt, Peter Raatz, Manfred Herrmann
  • Bleaching cotton-containing fabrics with hypochlorite at elevated temperatures
    Patent number: 4622037
    Abstract: Cotton-containing fabrics are bleached with hypochlorite in an aqueous alkaline liquor at elevated temperatures by a process in which bleaching is carried out at from 80.degree. to 110.degree. C. in the course of from 30 seconds to 25 minutes in the presence of a water-soluble polyhydroxy compound, as a readily oxidizable substance, in an amount of from 0.5 to 20 g/l.
    Type: Grant
    Filed: May 3, 1985
    Date of Patent: November 11, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Streit, Dieter Bassing, Karlheinz Gebert, Friedrich Klippel, Norbert Leppert
  • Agent for dissolving insoluble iron(III) compounds in highly alkaline textile treatment liquors
    Patent number: 4450083
    Abstract: An agent, based on reducing agents and complexing agents, for dissolving insoluble iron(III) compounds in aqueous textile treatment baths which are at a pH of 10 or more, which agent has the following composition:(a) from 4 to 65% by weight of one or more water-soluble hydroxycarbonyl compound or of an N- or O-acetal thereof, as the reducing agent,(b) from 10 to 80% by weight of one or more complexing agent which complexes Fe.sup.++ ions at a pH of 10 or more and(c) water in an amount equal to 100% minus the amounts of (a) and (b).
    Type: Grant
    Filed: March 4, 1983
    Date of Patent: May 22, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Streit, Klaus Lorenz, Norbert Leppert