Patents by Inventor Peter Johannes Dominicus Maas

Peter Johannes Dominicus Maas 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).

  • Process for the preparation of enantiomerically enriched indoline-2-carboxylic acid
    Patent number: 7732621
    Abstract: The present invention relates to a process for the preparation of an enantiomerically enriched optionally substituted indoline-2-carboxylic acid or a salt thereof, wherein an enantiomerically enriched chiral ortho-X-substituted phenylalanine compound, wherein X is a leaving group, is subjected to cyclisation, preferably at a temperature of below about 140° C., upon formation of the enantiomerically enriched indoline-2-carboxylic acid compound.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: June 8, 2010
    Assignee: DSM IP Assets B.V.
    Inventors: Andreas Hendrikus Maria De Vries, Johannes Gerardus De Vries, Friso Bernard Jan Van Assema, Ben De Lange, Daniel Mink, David John Hyett, Peter Johannes Dominicus Maas
  • Process for the preparation of dioxane acetic acid esters
    Patent number: 7442811
    Abstract: Process for the preparation of an ester of formula (1), wherein R1 represents a leaving group, CN, OH or a COOR5 group, R3 and R4 each independently represent a 1-3 C alkyl group, and R2 and R5 each independently represent an ester residue, wherein the corresponding salt with formula (2), wherein M represents H or an alkali (earth) metal in an inert solvent is contacted with an acid chloride forming agent to form the corresponding acid chloride, and the acid chloride is contacted with an alcohol with formula R2OH in the presence of N-methyl-morpholine. Preferably M represents an alkali metal, and R2 represents an alkyl group, particularly a t.-butyl group.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: October 28, 2008
    Assignee: AstraZeneca UK Limited
    Inventors: Hermanus Carolus Catherina Karel Bakel Van, Dominique Monique Charles Callant, Jacob Hermanus Mattheus Hero Kooistra, Peter Johannes Dominicus Maas