Patents by Inventor Gerben Sipma

Gerben Sipma 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).

  • Tricyclo{6.2.1.0.sup.1,6 }undecanes useful as fragrance chemicals
    Patent number: 5015761
    Abstract: Novel tricycloundecanones are disclosed having the general formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are hydrogen or 1 to 3 carbon alkyl groups having a total carbon number of six or less. These compounds are useful perfumery ingredients characterized by odors of the woody type.Useful derivatives of the compounds are also disclosed as well as a novel procedure for preparation thereof.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: May 14, 1991
    Assignee: PFW(Nederland)B.V.
    Inventors: Willem Lenselink, Gerben Sipma
  • Sulfur-containing flavoring agents
    Patent number: 4477678
    Abstract: Novel thioether compounds are disclosed which are useful as flavoring materials to enhance or impart meat-like flavors to foodstuffs. These compounds have the general formula ##STR1## where X can be, under specified conditions, --CH.sub.2 --, oxygen, or sulfur, Y can be oxygen or sulfur and R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are hydrogen or 1 to 3 carbon alkyl groups.
    Type: Grant
    Filed: January 4, 1983
    Date of Patent: October 16, 1984
    Assignee: P.F.W. Beheer B.V.
    Inventors: Steven van den Bosch, Dirk K. Kettenes, Kris B. de Ross, Gerben Sipma, Jan Stoffelsma
  • Novel sulfur-containing flavoring agents
    Patent number: 4380655
    Abstract: Novel thioether compounds are disclosed which are useful as flavoring materials to enhance or impart meat-like flavors to foodstuffs. These compounds have the general formula ##STR1## where X can be, under specified conditions, --CH.sub.2 --, oxygen, or sulfur, Y can be oxygen or sulfur and R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are hydrogen or 1 to 3 carbon alkyl groups.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: April 19, 1983
    Assignee: P.F.W. Beheer B.V.
    Inventors: Steven van den Bosch, Dirk K. Kettenes, Kris Bart de Roos, Gerben Sipma, Jan Stoffelsma
  • Sulfur-containing flavoring agents
    Patent number: 4119737
    Abstract: Novel thioether compounds are disclosed which are useful as flavoring materials to enhance or impart meat-like flavors to foodstuffs. These compounds have the general formula ##STR1## where X can be, under specified conditions, --CH.sub.2 --, oxygen, or sulfur, Y can be oxygen or sulfur and R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are hydrogen or 1 to 3 carbon alkyl groups.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: October 10, 1978
    Assignee: P.F.W. Beheer B.V.
    Inventors: Steven van den Bosch, Dirk Karel Kettenes, Kris Bart DE Roos, Gerben Sipma, Jan Stoffelsma