Patents by Inventor Yann Pressel

Yann Pressel 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).

  • Isomerization of ?-keto-allenes
    Patent number: 8802898
    Abstract: Isomerization of ?-keto-allenes of the general formula I wherein R1 is hydrogen, methyl or ethyl, in particular hydrogen or methyl; R2 is hydrogen or methyl; R3 is hydrogen or methyl, in particular methyl and R4 is an aliphatic hydrocarbon residue containing 1-37 carbon atoms, into corresponding ?,?-dienones of formula II by treatment with a basic ion exchange resin.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: August 12, 2014
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Reinhard Karge, Thomas Netscher, Yann Pressel
  • ISOMERIZATION OF BETA-KETO-ALLENES
    Publication number: 20130197272
    Abstract: Isomerization of ?-keto-allenes of the general formula I wherein R1 is hydrogen, methyl or ethyl, in particular hydrogen or methyl; R2 is hydrogen or methyl; R3 is hydrogen or methyl, in particular methyl and R4 is an aliphatic hydrocarbon residue containing 1-37 carbon atoms, into corresponding ?,?-dienones of formula II by treatment with a basic ion exchange resin.
    Type: Application
    Filed: April 18, 2011
    Publication date: August 1, 2013
    Applicant: DSM IP ASSETS B.V.
    Inventors: Werner Bonrath, Reinhard Karge, Thomas Netscher, Yann Pressel