Patents by Inventor Johannes T. de Hey

Johannes T. de Hey 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).

  • Hydroxy furanone preparation
    Patent number: 5149840
    Abstract: The invention provides a process for the preparation of natural 5-methyl- and 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one, by heating and reacting a pentose or 6-deoxyhexose in the presence of an amino acid and directly separating, the hydroxyfuranone from the reaction mixture by distillation under reduced pressure. Preferably the distillation is carried out in the presence of a high boiling organic solvent, particularly propylene glycol and glycerol. The amino acid is preferably lysine, proline or hydroxyproline.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: September 22, 1992
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Coenraad Decnop, Johannes M. van Dort, Johannes T. de Hey
  • Process for the preparation of flavor and fragrance materials
    Patent number: 4996069
    Abstract: The invention relates to a process for the preparation of flavor and fragrance materials by oxidizing a solution of carotene in an aprotic solvent under the influence of ultra-violet light. The carotene may be synthetic or obtained by extraction with an aprotic solvent or solvent mixture of carotene-containing vegetable material or micro-organisms, which are suitable for human consumption. The reaction is preferably carried out at ambient temperature with UV light with a wave length of 350-560 nm.
    Type: Grant
    Filed: November 15, 1989
    Date of Patent: February 26, 1991
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Johannes T. de Hey, Harrie Renes, Jan Visser