Patents by Inventor Douwe R. De Haan

Douwe R. De Haan 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).

  • 1-Crotonyl-2,2,6-trimethylcyclohexane
    Patent number: 4136066
    Abstract: 1-Crotonoyl-2,2,6-trimethylcyclohexane occurs in four stereoisomeric forms. In particular the trans, E and cis, E isomers having interesting organoleptic properties and are useful in the preparation of perfume compositions. Processes for preparing the stereoisomers, in a pure form or as mixtures, are described.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: January 23, 1979
    Assignee: P.F.W. Beheer B.V.
    Inventors: Douwe R. De Haan, Dirk K. Kettenes