Patents by Inventor Axel von Raven

Axel von Raven 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 enhancing the whiteness, brightness and chromaticity of fillers and pigments
    Patent number: 5846382
    Abstract: The invention relates to the addition of sulfonated zinc, manganese, or aluminum phthalocyanines to inorganic fillers and pigments for enhancing their whiteness, brightness and chromaticity, as well as to the fillers and pigments and mixtures thereof so obtained, and to the use thereof in e.g. paper manufacture.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: December 8, 1998
    Assignee: Jorax GmbH
    Inventor: Axel von Raven
  • Process for enhancing the whiteness, brightness and chormaticity of paper making fibres
    Patent number: 5482514
    Abstract: The present invention relates to the addition of photosensitising compounds to woodpulps and mixtures thereof for enhancing their whiteness, brightness and chromaticity, as well as to the paper making fibres so obtained and the use thereof.
    Type: Grant
    Filed: September 9, 1993
    Date of Patent: January 9, 1996
    Assignee: Ciba-Geigy Corporation
    Inventor: Axel von Raven
  • Bleaching paper pulp with modified silicate ion exchanger and hydrogen peroxide
    Patent number: 5039377
    Abstract: A method for bleaching pulp using an alkaline, peroxide-containing bleaching agent for chemical pulp, mechanical pulp, waste paper and/or mixtures thereof, which optionally contains water glass and/or a complexing agent, contains, as an additive, a silicate ion exchanger which has been modified using an alkali metal carbonate or alkali metal hydrogen carbonate.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: August 13, 1991
    Assignee: Sud-Chemie, Aktiengesellschaft
    Inventors: Axel von Raven, Josef Weigl, Friedrich Ruf, Herbert Mayer
  • Method for the processing of fecal waste
    Patent number: 4486216
    Abstract: A method for the processing of fecal waste by treatment with mineral clay, characterized in that:A. a smectite clay, enriched with aerobic and anaerobic microorganisms, specific for the digestion of fecal waste, and with plant preparations which promote the increase of said microorganisms, and lime, is allowed to digest the fecal waste; andB. an acid phosphate is added to the fecal waste treated in this manner, after addition of the enriched smectite clay and shortly before use of the treated waste as a fertilizer.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: December 4, 1984
    Inventors: Axel von Raven, Hans Buckl, Ulrich Kroner