Patents by Inventor Wolf Mehl

Wolf Mehl 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).

  • Hydrogenation of halonitroaromatic compounds
    Patent number: 5801284
    Abstract: Process for preparing haloaromatic amines by catalytic hydrogenation of the corresponding halonitroaromatic compounds, characterized in that iron-containing Raney nickel is used as catalyst, where the haloaromatic amines prepared can be used for the synthesis of photographic couplers which are useful in photographic emulsions or elements.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: September 1, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Klaus-Christian Paetz, Helmut Fiege, Heinz Ulrich Blank, Dieter Brueck, Wolf Mehl
  • Process for separating off alkanols from other organic compounds of higher carbon number
    Patent number: 5504239
    Abstract: A first alkanol having from 1 to 3 carbon atoms can be separated off from other organic compounds of higher carbon number from the group comprising other alcohols, polyalcohols, ethers, oxo compounds, esters of carboxylic acids and of carbonic acid, haloaliphatics, amines, amides, hydrocarbons, carboxylic acids and nitriles, which in each case have at least 1 carbon atom more than the first alkanol, where in the case of halogenoaliphatics, halogen substituents are counted as further carbon atoms, by permeation on membranes, if a water content from 1 to 30% by weight, preferably from 5 to 15% by weight, based on the amount of mixture and water, is maintained.
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: April 2, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolf Mehl, Wolfgang Scheinert, Ingo Janisch, Andreas Groschl