Patents by Inventor Isolde Lowe

Isolde Lowe 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).

  • Oxidation hair dye compositions containing 3,4,5-triaminopyrazole derivatives and 3,4,5-triaminopyrazole derivatives
    Patent number: 5766576
    Abstract: The oxidation hair dye composition for oxidative dyeing of hair is based on a combination of developer substance and coupler substance and contains at least one 3,4,5-triamino-pyrazole derivative compound selected from the group consisting of 1-methyl-3,4,5-triaminopyrazole, 3,5-diamino-1-methyl-4-methylaminopyrazole, 3,5-diamino-4-(2'-hydroxyethyl) amino-1-methylpyrazole and physiologically compatible, water-soluble salts of the foregoing pyrazole derivative compounds, as the developer substance. The invention also includes novel 3,4,5-triaminopyrazole derivative compounds.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: June 16, 1998
    Assignee: Wella Aktiengesellschaft
    Inventors: Isolde Lowe, Stefan Gerstung, Wolfgang R. Balzer
  • Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-be nzene
    Patent number: 5132461
    Abstract: A process is disclosed for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-benz ene, by means of a two-stage technique proceeding from the reaction product of 1,4-diamino-2-nitrobenzene with chloroformic acid chloroethyl ester, or by means of a multiple-stage technique which is based upon an improved process for the production of the pre-stage 4-ethylamino-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene.
    Type: Grant
    Filed: December 5, 1986
    Date of Patent: July 21, 1992
    Assignee: Wella Aktiengesellschaft
    Inventors: Thomas Clausen, Isolde Lowe
  • Process for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitroben zene
    Patent number: 4900869
    Abstract: A process is disclosed for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitrobenze ne, by means of a two-stage technique proceeding from the reaction product of 1,4-diamino-2-nitrobenzene with chloroformic acid chloroethyl ester, or by means of a multiple-stage technique which is based upon an improved process for the production of the pre-stage 4-ethylamino-1-[(2'-hydroxyethyl)-amino]-2-nitrobenzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitrobenzene.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: February 13, 1990
    Assignee: Aktiengesellschaft Wella
    Inventors: Thomas Clausen, Isolde Lowe