Patents by Inventor David J. Wrigley

David J. Wrigley 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).

  • Patent number: 11970668
    Abstract: Provided herein are heat activated fuel detergents, liquid fuel compositions including such heat activated fuel detergents and methods for improving intake valve and injector cleanliness of an engine for a vehicle utilizing such liquid fuel composition.
    Type: Grant
    Filed: May 26, 2022
    Date of Patent: April 30, 2024
    Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY
    Inventors: David J. Abdallah, Krystal B. Wrigley
  • Patent number: 8415415
    Abstract: Halogen-free flame retardant compositions exhibiting flame retardance and retention of mechanical properties, especially elongation at break, upon long-term high temperature exposure and comprising a) at least one copolyester thermoplastic elastomer, and b) from at or about 1 to at or about 30 weight percent, based on the total weight of the composition, of at least one flame retardant comprising a phosphinate, diphosphinate and/or polymers of these; c) from at or about 0.25 to at or about 15 weight percent, based on the total weight of the flame retardant composition, of one or more polyhydroxy polymers having a number average molecular weight of at least 2000 and selected from the group consisting of ethylene vinyl alcohol copolymers and poly(vinyl alcohol)s.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: April 9, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Eleni Karayianni, David J. Wrigley
  • Publication number: 20120211256
    Abstract: Halogen-free flame retardant compositions exhibiting flame retardance and retention of mechanical properties, especially elongation at break, upon long-term high temperature exposure and comprising a) at least one copolyester thermoplastic elastomer, and b) from at or about 1 to at or about 30 weight percent, based on the total weight of the composition, of at least one flame retardant comprising a phosphinate, diphosphinate and/or polymers of these; c) from at or about 0.25 to at or about 15 weight percent, based on the total weight of the flame retardant composition, of one or more polyhydroxy polymers having a number average molecular weight of at least 2000 and selected from the group consisting of ethylene vinyl alcohol copolymers and poly(vinyl alcohol)s.
    Type: Application
    Filed: August 17, 2011
    Publication date: August 23, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Eleni Karayianni, David J. Wrigley
  • Publication number: 20120208954
    Abstract: Copolyetherester compositions comprising a melt-mixed blend of one or more copolyetherester(s) comprising a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, and (b) about 0.25 to about 15 weight percent of one or more polyhydric alcohols having more than two hydroxyl groups; wherein all weight percentages are based on the total weight of the copolyetherester composition. Molded or extruded thermoplastic articles formed from the copolyetherester compositions, wherein 2 mm test bars prepared from said copolyetherester composition, and exposed at a test temperature of 150° C. for a test period of about 120 hours, in an atmosphere of air, and tested according to according to ISO 527-2/5A method have, on average, a retention of tensile strain at break of at least 50 percent as compared with an unexposed control having identical composition and shape.
    Type: Application
    Filed: April 26, 2012
    Publication date: August 16, 2012
    Applicant: E. I. Du Pont De Nemours and Company
    Inventors: ROBERT J. PALMER, Judith Alison Peacock, David J. Wrigley
  • Publication number: 20120165443
    Abstract: Disclosed is a copolyether ester elastomer resin including a polybutylene terephthalate (PBT) repeat unit, and a titanium catalyst deactivating compound.
    Type: Application
    Filed: February 27, 2012
    Publication date: June 28, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Judith Alison Peacock, David J. Wrigley
  • Patent number: 8148489
    Abstract: A method for reducing organic carbon emissions from PBT-block-containing resins is disclosed. The method involves adding a titanium-catalyst deactivating compound to the resin after polymerisation.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: April 3, 2012
    Assignee: E. I. du Pont De Nemours and Company
    Inventors: Judith Alison Peacock, David J. Wrigley
  • Publication number: 20100029837
    Abstract: Copolyetherester compositions comprising a melt-mixed blend of one or more copolyetherester(s) comprising a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, and (b) about 0.25 to about 15 weight percent of one or more polyhydric alcohols having more than two hydroxyl groups; wherein all weight percentages are based on the total weight of the copolyetherester composition. Molded or extruded thermoplastic articles formed from the copolyetherester compositions, wherein 2 mm test bars prepared from said copolyetherester composition, and exposed at a test temperature of 150° C. for a test period of about 120 hours, in an atmosphere of air, and tested according to according to ISO 527-2/5A method have, on average, a retention of tensile strain at break of at least 50 percent as compared with an unexposed control having identical composition and shape.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 4, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Robert J. Palmer, Judith Alison Peacock, David J. Wrigley
  • Patent number: 7638591
    Abstract: Polyetherester elastomers comprising about 25 to about 59 weight percent poly(trimethylene ether) ester soft segments and about 41 to about 75 weight percent hard segments, wherein the poly(trimethylene ether) ester soft segments are derived from poly(trimethylene ether) glycol having a number average molecular weight of about 600 to about 2500. Compositions thereof and articles made therefrom are disclosed.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: December 29, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: James Michael McKenna, Edward Maxwell de Brant Smith, David J. Wrigley
  • Publication number: 20070225475
    Abstract: A method for reducing organic carbon emissions from PBT-block-containing resins is disclosed. The method involves adding a titanium-catalyst deactivating compound to the resin after polymerisation.
    Type: Application
    Filed: March 15, 2007
    Publication date: September 27, 2007
    Inventors: Judith Alison Peacock, David J. Wrigley