Patents by Inventor Peter Miederer

Peter Miederer 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).

  • Concentrated leucoindigo solutions
    Patent number: 6428581
    Abstract: Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: August 6, 2002
    Assignee: DyStar Textilfarben GmbH & Co. Deutschland KG
    Inventors: Manfred Gäng, Rudolf Krüger, Peter Miederer
  • Leuco vat dye preparations in granule form
    Patent number: 6007587
    Abstract: Granules comprising as essential constituents a leuco vat dye, an alkali metal hydroxide and a mixture of from 10 to 100% by weight of an .alpha.-hydroxy-C.sub.1 -C.sub.4 -alkylsulfinic acid, one of its salts or derivatives and from 0 to 90% by weight of hydrosulfite as reductant, are prepared and used for dyeing cellulosic textile material.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: December 28, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Gang, Rudolf Kruger, Peter Miederer, Eberhard Beckmann
  • Leuco vat-dye preparations in granule form
    Patent number: 5888254
    Abstract: Granular leuco vat-dye preparations containing, as essential components, leuco vat-dye, reducing agents and alkaline metal hydroxide, and the production of said preparations and their use in dyeing cellulose-containing textile materials.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: March 30, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Gang, Rudolf Kruger, Peter Miederer, Harald Schluter, Peter Schultz, Manfred R. Wolf
  • Leucoindigo preparatations in granule form
    Patent number: 5637116
    Abstract: Leucoindigo preparations in granule form consisting essentially of leucoindigo and alkali metal hydroxide and production of these preparations and use thereof for dyeing cellulose-containing textile material.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: June 10, 1997
    Assignee: BASF Aktiengeschaft
    Inventors: Manfred Gaeng, Peter Miederer, Peter Schultz
  • Preparation of 1,4-diamino-2,3-dicyanoanthraquinone
    Patent number: 4871481
    Abstract: 1,4-Diaminoanthraquinone-2-sulfonic acid or salts thereof are reacted with cyanide ions at pH 8-11 in the presence of oxidizing agents in a mixture of water and 1-methoxy-2-propanol, 2-methoxy-1-propanol, N,N-dimethylformamide, N,N-dimethylacetamide, N,N-dimethylpropionamide, dimethyl sulfoxide, dioxane, N-methylpyrrolidone or mixtures thereof, the ratio water: organic liquid being .gtoreq.3:1, the reaction proceeding at higher concentrations than in a purely aqueous medium and producing appreciably purer products in a high space-time yield.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: October 3, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Miederer, Eberhard Michaelis
  • Preparation of emulsifiable polyethylene by oxidizing polyethylene in a fluidized bed reactor
    Patent number: 4459388
    Abstract: A process for the preparation of water-emulsifiable polyethylene by oxidizing high density polyethylene, at below the softening point of the polyethylene, in the presence of oxygen, wherein the oxidation is carried out in a fluidized bed reactor, using a polyethylene which beforehand has been heated, with exclusion of oxygen, in the presence of a compound which forms free radicals.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: July 10, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Albert Hettche, Stefan Weiss, Peter Miederer, Lutz Goethlich, Juergen Ciprian
  • Uniformly disperse dyed water-swellable cellulosic fibers
    Patent number: 4154577
    Abstract: Uniformly dyed water-swellable cellulosic fibers obtained by dyeing cellulosic fibers in the swollen state with a dye of the formula ##STR1## in which D is the radical of a diazo component and R is an aliphatic, cycloaliphatic or araliphatic radical. The fibers are eminently suitable as textile material.
    Type: Grant
    Filed: March 30, 1978
    Date of Patent: May 15, 1979
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Miederer, Johannes Dehnert