Patents by Inventor John Elton Dewhurst

John Elton Dewhurst 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).

  • Trimerization catalysts from sterically hindered salts
    Patent number: 9890236
    Abstract: The present invention provides trimerization catalyst compositions having a sterically hindered carboxylate salt and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: February 13, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • Trimer catalyst additives for improving foam processability
    Patent number: 9878318
    Abstract: The present invention provides trimerization catalyst compositions and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions. The catalyst composition is the contact product of at least one ?,?-unsaturated carboxylate salt and at least one second carboxylate salt.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: January 30, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst, Gamini Ananda Vedage
  • Trimer catalysts with improved processability and surface cure
    Patent number: 9815932
    Abstract: The present invention provides trimerization catalyst compositions having an ?,?-unsaturated carboxylate salt and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: November 14, 2017
    Assignee: Evonik Degussa GmbH
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • TRIMER CATALYST ADDITIVES FOR IMPROVING FOAM PROCESSABILITY
    Publication number: 20140005037
    Abstract: The present invention provides trimerization catalyst compositions and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions. The catalyst composition is the contact product of at least one ?,?-unsaturated carboxylate salt and at least one second carboxylate salt.
    Type: Application
    Filed: September 9, 2013
    Publication date: January 2, 2014
    Inventors: Juan Jesus BURDENIUC, Torsten PANITZSCH, John Elton DEWHURST, Gamini Ananda VEDAGE
  • TRIMERIZATION CATALYSTS FROM STERICALLY HINDERED SALTS
    Publication number: 20130341562
    Abstract: The present invention provides trimerization catalyst compositions having a sterically hindered carboxylate salt and methods to produce a polyisocyanurate/-polyurethane foam using such trimerization catalyst compositions.
    Type: Application
    Filed: August 28, 2013
    Publication date: December 26, 2013
    Applicant: AIR PRODUCTS AND CHEMICALS INC.
    Inventors: Juan Jesus BURDENIUC, Torsten PANITZSCH, John Elton DEWHURST
  • Trimer catalysts with improved processability and surface cure
    Patent number: 8580864
    Abstract: The present invention provides trimerization catalyst compositions having an ?,?-unsaturated carboxylate salt and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: November 12, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • Trimer catalyst additives for improving foam processability
    Patent number: 8552077
    Abstract: The present invention provides trimerization catalyst compositions and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions. The catalyst composition is the contact product of at least one ?,?-unsaturated carboxylate salt and at least one second carboxylate salt.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: October 8, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst, Gamini Ananda Vedage
  • Trimerization catalysts from sterically hindered salts
    Patent number: 8530534
    Abstract: The present invention provides trimerization catalyst compositions having a sterically hindered carboxylate salt and methods to produce a polyisocyanurate/-polyurethane foam using such trimerization catalyst compositions.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: September 10, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • Stabilized carbanions as trimerization catalysts
    Patent number: 8445555
    Abstract: The present invention provides trimerization catalyst compositions having at least one carbanion compound and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: May 21, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • Additives for Improving Surface Cure and Dimensional Stability of Polyurethane Foams
    Publication number: 20080269365
    Abstract: A composition for making a polyurethane foam includes a fugitive tertiary amine urethane catalyst and amidoamine and/or imidazoline property enhancing additives. The inclusion of one or more of these property enhancing additives serves to reduce or eliminate physical property and surface deterioration of polyurethane foams made at reduced density.
    Type: Application
    Filed: April 25, 2007
    Publication date: October 30, 2008
    Inventors: Gary Dale Andrew, John Elton Dewhurst, Mark Leo Listemann, Goran Zarkov, Yuedong Zhang
  • Stabilized carbanions as trimerization catalysts
    Publication number: 20080015274
    Abstract: The present invention provides trimerization catalyst compositions having at least one carbanion compound and methods to produce a polyisocyanurate/polyurethane foam using such trimerization catalyst compositions.
    Type: Application
    Filed: July 13, 2006
    Publication date: January 17, 2008
    Inventors: Juan Jesus Burdeniuc, Torsten Panitzsch, John Elton Dewhurst
  • Dimensional stabilizing, cell opening additives for polyurethane flexible and rigid foams
    Patent number: 6046249
    Abstract: A method for preparing a polyurethane flexible or rigid foam by reacting an organic polyisocyanate with a polyol in the presence of urethane catalyst, water as a blowing agent, optionally a silicone surfactant, and a cell opener characterized in that the cell opener comprises the reaction product of a C1-C20 hydrocarbyl group-containing organic acid anhydride and a substituted phenol which may be alkoxylated or an alkoxylated primary alcohol, optionally reacted in the presence of a tertiary amine urethane catalyst.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: April 4, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: James Douglas Tobias, Julia Renae Bennett, Gary Dale Andrew, John Elton Dewhurst, Robert G. Petrella