Patents by Inventor Rolf Kuenzi

Rolf Kuenzi 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).

  • VITAMIN K2 SYNTHESIS
    Publication number: 20230159429
    Abstract: The present invention relates to a new process of production of menaquinone 4, which is also known as vitamin K2.
    Type: Application
    Filed: February 16, 2021
    Publication date: May 25, 2023
    Inventors: Werner BONRATH, Rolf KUENZI
  • IMPROVED SYNTHESIS OF AN EXPOXIDATION-CATALYST
    Publication number: 20220024960
    Abstract: The present invention relates to an improved process to produce a specific and very efficient epoxidation-catalyst (1,2:4,5-Di-O-isopropylidene-?-D-erythro-2,3-hexodiulo-2,6-pyranose).
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Werner BONRATH, Rolf KUENZI
  • Manufacture of gamma-delta-unsaturated ketones
    Patent number: 8664450
    Abstract: A process for the manufacture of gamma-delta-unsaturated ketones of formula (R1)(R2)C?CH—CH2—CH2—CO—R3 (I), wherein R1 is methyl or ethyl; R2 is a saturated or unsaturated linear or cyclic hydrocarbon residue and R3 is methyl or ethyl, by reacting a tertiary vinyl carbinol of formula (R1)(R2)C(OH)—CH?CH2 (II) with an isopropenyl methyl or ethyl ether of formula H3C—C(OR3)?CH2 (III) in the pre-sence of an ammonium salt as catalyst.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: March 4, 2014
    Assignee: DSM IP Assets B.V.
    Inventors: Fabrice Aquino, Werner Bonrath, Rolf Kuenzi
  • Allyl and propargyl ethers
    Patent number: 8563780
    Abstract: Allyl and propargyl ethers of the formula X—C(R1)(R2)—O—C(CH3)(R3)—OCH3 (I), wherein X is an ethynyl or vinyl group, R1 is methyl or ethyl, R2 is a saturated or unsaturated linear or cyclic aliphatic hydrocarbon residue and R3 is methyl or ethyl, a method for their preparation and their use in the manufacture of ?-ketoallenes, ?,?-unsaturated carbonyl compounds and ?,?-unsaturated ketones.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: October 22, 2013
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Rolf Kuenzi
  • Process for the preparation of (E, E)-farnesyl acetone
    Patent number: 8217203
    Abstract: A process for the preparation of E-farnesyl acetone characterized by reaction of nerolidol with isopropenylmethyl ether in the presence of an acidic catalyst at elevated temperature and isolation by fractionated distillation.
    Type: Grant
    Filed: July 22, 2008
    Date of Patent: July 10, 2012
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Rolf Kuenzi
  • ALLYL AND PROPARGYL ETHERS
    Publication number: 20120029240
    Abstract: Allyl and propargyl ethers of the formula X—C(R1)(R2)—O—C(CH3)(R3)—OCH3 (I), wherein X is an ethynyl or vinyl group, R1 is methyl or ethyl, R2 is a saturated or unsaturated linear or cyclic aliphatic hydrocarbon residue and R3 is methyl or ethyl, a method for their preparation and their use in the manufacture of ?-ketoallenes, ?,?-unsaturated carbonyl compounds and ?,?-unsaturated ketones.
    Type: Application
    Filed: May 12, 2009
    Publication date: February 2, 2012
    Inventors: Werner Bonrath, Rolf Kuenzi
  • MANUFACTURE OF GAMMA-DELTA-UNSATURATED KETONES
    Publication number: 20110213185
    Abstract: A process for the manufacture of gamma-delta -unsaturated ketones of formula (R1)(R2)C?CH—CH2—CH2—CO—R3 (I), wherein R1 is methyl or ethyl; R2 is a saturated or unsaturated linear or cyclic hydrocarbon residue and R3 is methyl or ethyl, by reacting a tertiary vinyl carbinol of formula (R1)(R2)C(OH)—CH?CH2 (II) with an isopropenyl methyl or ethyl ether of formula H3C—C(OR3)?CH2 (Ill) in the pre-sence of an ammonium salt as catalyst.
    Type: Application
    Filed: September 28, 2009
    Publication date: September 1, 2011
    Inventors: Fabrice Aquino, Werner Bonrath, Rolf Kuenzi
  • Process for the preparation of saturated aliphatic ketones
    Patent number: 7935849
    Abstract: Saturated aliphatic ketones, e.g. hexahydropseudoionone, may be prepared by hydrogenating an olefinically unsaturated ketone, e.g. pseudoionone in a continuous fixed-bed mode in the absence of a solvent in the presence of a catalyst comprising a noble metal deposited on a carrier.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: May 3, 2011
    Assignee: DSM IP Assets B.V.
    Inventors: Werner Bonrath, Thomas Kircher, Rolf Kuenzi, Johannes Tschumi
  • PROCESS FOR THE PREPARATION OF (E, E)-FARNESYL ACETONE
    Publication number: 20100204520
    Abstract: A process for the preparation of E-farnesyl acetone characterized by reaction of nerolidol with isopropenylmethyl ether in the presence of an acidic catalyst at elevated temperature and isolation by fractionated distillation.
    Type: Application
    Filed: July 22, 2008
    Publication date: August 12, 2010
    Applicant: DSM IP ASSETS
    Inventors: Werner Bonrath, Rolf Kuenzi
  • Process for the Preparation of Saturated Aliphatic Ketones
    Publication number: 20080139856
    Abstract: Saturated aliphatic ketones, e.g. hexahydropseudoionone, may be prepared by hydrogenating an olefinically unsaturated ketone, e.g. pseudoionone in a continuous fixed-bed mode in the absence of a solvent in the presence of a catalyst comprising a noble metal deposited on a carrier.
    Type: Application
    Filed: September 14, 2005
    Publication date: June 12, 2008
    Applicant: DSM IP ASSETS B.V.
    Inventors: Werner Bonrath, Thomas Kircher, Rolf Kuenzi, Johannes Tschumi