Patents by Inventor Willi Rojahn

Willi Rojahn 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).

  • Use of esters of branch-chain carboxylic acids with branch-chain alcohols as ingredients of cosmetic agents
    Patent number: 5711939
    Abstract: The invention comprises the use of multiple-branch esters of the common formula A, formed from branch-chain carboxylic acids and branch-chain alcohols, as ingredients of cosmetic agents for the protection and care of human skin ##STR1## as well as cosmetic agents containing such branched esters of common formula A.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: January 27, 1998
    Assignee: Dragoco Gerberding & Co., GmbH
    Inventors: Ernst-Joachim Brunke, Willi Rojahn, Gerhard Spirik
  • Fixative for perfume compositions
    Patent number: 4313855
    Abstract: A fixative for perfume compositions, 1-(2,6,6-trimethylcyclohexyl)-hexane-3-ol, itself odorless to many people, brings about a "rounding-off" of the perfume while increasing its intensity. The compound is made by condensation of citral with pentane-2-on, followed by cyclization and hydrogenation.
    Type: Grant
    Filed: March 18, 1980
    Date of Patent: February 2, 1982
    Assignee: Dragoco Gerberding & Co. GmbH
    Inventors: Erich Klein, Willi Rojahn
  • Fixative for perfume compositions
    Patent number: 4252986
    Abstract: A fixative for perfume compositions, 1-(2,6,6-trimethylcyclohexyl)-hexane-3-ol, itself odorless to many people, brings about a "rounding-off" of the perfume while increasing its intensity. The compound is made by condensation of citral with pentane-2-on, followed by cyclization and hydration.
    Type: Grant
    Filed: February 13, 1979
    Date of Patent: February 24, 1981
    Assignee: Dragoco Gerberding & Co. GmbH
    Inventors: Erich Klein, Willi Rojahn