Patents by Inventor John Chu

John Chu 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: 8193283
    Abstract: Disclosed are golf balls having soft, resilient bimodal ionomeric covers with improved softness and scuff resistance and methods for their preparation. The soft, resilient bimodal ionomeric covers comprise at least partially neutralized mixtures of carboxylate functionalized terpolymers (molecular weight between about 80,000 and 500,000) with carboxylate functionalized ethylene low copolymers (molecular weight between about 2,000 and 30,000).
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: June 5, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Publication number: 20120093777
    Abstract: A composition is disclosed comprising virus in a formulation comprising a polyhydroxy hydrocarbon buffered to maintain a pH in a range from about 7 to about 8.5 at a temperature in the range from about 2° C. to 27° C. Methods for concentrating and purifying virus preparations are also disclosed.
    Type: Application
    Filed: December 22, 2011
    Publication date: April 19, 2012
    Inventors: Andreas Frei, Henry K.H. Kwan, Varda E. Sandweiss, Gary J. Vellekamp, Pui-Ho Yuen, Laureano L. Bondoc, JR., Frederick William Porter, IV, John Chu-Tay Tang, Peter Ihnat
  • Publication number: 20120071271
    Abstract: A phase transition golf ball comprises a phase transition material. The phase transition material may optionally include a microwave susceptor or an induction susceptor. The phase transition material preferably comprises an ethylene acid copolymer, or an ionomer of an ethylene acid copolymer. The performance of the phase transition golf ball, for example its hardness or compression, is adjusted by inducing a complete or partial phase transition in the phase transition material. The extent of the adjustment in performance is correlated with the extent of the phase transition. Preferably, the phase transition is reversible and repeatable and takes place at temperatures that might be achieved through the use of common household appliances. Also preferably, the phase transition material returns to its original state over an extended period, for example hours or days.
    Type: Application
    Filed: November 30, 2011
    Publication date: March 22, 2012
    Applicant: E.I.DU PONT DE NEMOURS AND COMPANY
    Inventors: John Chu Chen, Janice V. Granato, Matthew S. Hall, Peter A. Morken
  • Patent number: 8088026
    Abstract: A phase transition golf ball comprises a phase transition material. The phase transition material may optionally include a microwave susceptor or an induction susceptor. The phase transition material preferably comprises an ethylene acid copolymer, or an ionomer of an ethylene acid copolymer. The performance of the phase transition golf ball, for example its hardness or compression, is adjusted by inducing a complete or partial phase transition in the phase transition material. The extent of the adjustment in performance is correlated with the extent of the phase transition. Preferably, the phase transition is reversible and repeatable and takes place at temperatures that might be achieved through the use of common household appliances. Also preferably, the phase transition material returns to its original state over an extended period, for example hours or days.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: January 3, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John Chu Chen, Janice V. Granato, Matthew S. Hall, Peter A. Morken
  • Publication number: 20110306442
    Abstract: Provided is a composition comprising a mixture of a high molecular weight (Mw between 80,000 and 500,000 Da) carboxylate functionalized ethylene terpolymer, a high molecular weight (Mw between 80,000 and 500,000 Da) carboxylate functionalized ethylene dipolymer and a low molecular weight (Mw between 2,000 and 30,000 Da) carboxylate functionalized ethylene copolymer wherein the carboxylic acid groups are at least partially neutralized to form salts containing zinc cations. The composition provides a good balance of hardness, flexural modulus and scuff resistance. The composition is used in films, multilayer structures and other articles of manufacture, such as golf balls.
    Type: Application
    Filed: June 15, 2010
    Publication date: December 15, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventor: JOHN CHU CHEN
  • Patent number: 8075967
    Abstract: Disclosed is a blended composition comprising a humidity-dependent composition having a ratio of wet cup permeance to dry cup permeance greater than 10 and a crystallizable polymer sufficiently permeable to oxygen, carbon dioxide and water vapor, exhibiting an increase in permeability to at least one of oxygen and carbon dioxide by a factor of at least 2.5 over a temperature range of 10° C. between 0° C. and 40° C. Also disclosed are packaging materials comprising the blended composition and methods for storing respiring materials using the packaging materials.
    Type: Grant
    Filed: August 26, 2008
    Date of Patent: December 13, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Publication number: 20110300273
    Abstract: Disclosed are moisture and gas permeable films which can comprise or be obtained from a blend of a polyamide with a potassium-containing ionomer of an ethylene acid copolymer, an ethylene ester dipolymer, and optional compatibilizer selected from dicarboxylate-containing polymers and ethylene glycidyl ester copolymers. The films are suitable for preparation of tubular casings and shrinkbags, in particular, casings for smoked foodstuffs.
    Type: Application
    Filed: May 18, 2011
    Publication date: December 8, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventor: John Chu Chen
  • Patent number: 8071223
    Abstract: Disclosed are films obtained from blends of ethylene copolymers with organic acid salt-modified potassium ionomeric copolymers. The films of the present invention can be welded using RF energy.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: December 6, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Patent number: 8057872
    Abstract: Disclosed is a multilayer structure comprising a layer of humidity-dependent composition having a ratio of wet cup permeance to dry cup permeance greater than 10 and a layer of crystallizable polymer sufficiently permeable to oxygen, carbon dioxide and water vapor, exhibiting an increase in permeability to at least one of oxygen and carbon dioxide by a factor of at least 2.5 over a temperature range of 10° C. between 0° C. and 40° C. Also disclosed are packaging materials comprising the multilayer structure and methods for storing respiring materials using the packaging materials.
    Type: Grant
    Filed: August 26, 2008
    Date of Patent: November 15, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Patent number: 8043664
    Abstract: Disclosed are films obtained from blends of ethylene copolymers with organic acid salt-modified potassium ionomeric copolymers. The films of the present invention can be welded using RF energy.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: October 25, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Patent number: 8021746
    Abstract: Disclosed are rigid or semi-rigid multilayer structures that provide high oxygen permeability values comprising metallocene polyethylene, ethylene/vinyl acetate copolymers or highly neutralized blends of ethylene acid copolymers, organic acid salts and optionally one or more ethylene-containing polymers or silicon-containing polymers. Such structures have improved oxygen permeability and are useful in packaging food products such as case ready meat, fish, sausage, fresh produce, and the like that require breathable packages.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: September 20, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Publication number: 20110152007
    Abstract: Provided is a method for increasing the melt flow of a composition comprising a mixture of high molecular weight carboxylate functionalized ethylene copolymers (Mw between 80,000 and 500,000 Da) with low molecular weight carboxylate functionalized ethylene copolymers (Mw between 2,000 and 30,000 Da), wherein the carboxylic acid groups are at least partially neutralized to form salts containing zinc cations. The method comprises melt mixing the composition with ionomers containing cations other than zinc. Also disclosed are trimodal compositions comprising high molecular weight terpolymers, high molecular weight dipolymers and low molecular weight dipolymers wherein the carboxylic acid groups are at least partially neutralized to salts containing zinc cations and non-zinc cations. The compositions are used in films, multilayer structures and other articles of manufacture.
    Type: Application
    Filed: December 22, 2009
    Publication date: June 23, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventor: JOHN CHU CHEN
  • Publication number: 20110143003
    Abstract: A film comprises or is produced from a composition comprising a blend of a polyamide and an organic acid modified ionomer having its acid moiety at least partially neutralized to salts containing a majority of alkali metal ions, and the composition optionally comprises a compatibilizer selected from dicarboxylate-containing polymers, softened ethylene acid copolymers, ethylene glycidyl ester copolymers, or combinations of two or more thereof.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 16, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventor: John Chu Chen
  • Publication number: 20110091714
    Abstract: Monolithic films are provided having controlled regional breathability with high MVTR regions and low MVTR regions. The zoned monolithic films are be made by selectively applying coatings to a monolithic film prepared from organic acid-modified ionomer resins.
    Type: Application
    Filed: October 15, 2010
    Publication date: April 21, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: John Chu Chen, Donna Lynn Visioli
  • Publication number: 20110092869
    Abstract: Articles having zoned breathability such as personal hygiene articles are provided having controlled regional breathability with high MVTR regions and low MVTR regions. The zoned breathability articles comprise organic acid-modified ionomer resins.
    Type: Application
    Filed: October 15, 2010
    Publication date: April 21, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: John Chu Chen, Donna Lynn Visioli
  • Publication number: 20110079534
    Abstract: Disclosed are films obtained from blends of ethylene copolymers with organic acid salt-modified potassium ionomeric copolymers. The films of the present invention can be welded using RF energy.
    Type: Application
    Filed: December 14, 2010
    Publication date: April 7, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: John Chu Chen, David J. Walsh
  • Publication number: 20110081536
    Abstract: Disclosed are films obtained from blends of ethylene copolymers with organic acid salt-modified potassium ionomeric copolymers. The films of the present invention can be welded using RF energy.
    Type: Application
    Filed: December 14, 2010
    Publication date: April 7, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: JOHN CHU CHEN, DAVID J. WALSH
  • Patent number: 7875680
    Abstract: Disclosed are films obtained from blends of ethylene copolymers with organic acid salt-modified potassium ionomeric copolymers. The films of the present invention can be welded using RF energy.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: January 25, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Chu Chen
  • Patent number: 7838123
    Abstract: Disclosed is a variable vapor barrier for moisture control of buildings comprising or formed from a material having a moisture permeance of less than 0.1 perms (grains/h·ft2·inches of Hg) at less than 50% average humidity, such as from 10 to 50% or 20 to 40%; and a moisture permeance greater than 4, or greater than 10 perms at greater than 60% average humidity, such as from 60 to 90%, or 70 to 80%. Also disclosed are articles comprising the variable vapor barrier and methods of their use.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: November 23, 2010
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John Chu Chen, Ashok Harakhlal Shah
  • Patent number: 7838104
    Abstract: Disclosed is a multilayer film or sheet, which comprises at least one vapor barrier layer and at least one vapor transmission-adjusting layer wherein the vapor transmission-adjusting layer comprises a neutralized acid copolymer or ionomer thereof, an organic acid, and optionally other polymers, having a ratio of wet cup permeance to dry cup permeance greater than 10. The vapor barrier layer comprises ethylene polymer, propylene polymer, polyvinyl alcohol, polyamide, polyester, ethylene vinyl alcohol copolymer, polyvinylidene chloride, PVC, or combinations of two or more thereof. The film is useful as a variable vapor barrier for moisture control of buildings. Also disclosed are articles comprising the multilayer film.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: November 23, 2010
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: John Chu Chen, Donna Lynn Visioli