Patents by Inventor Wen P. Wu
Wen P. Wu 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).
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Patent number: 7166248Abstract: A method for producing an alkenyl aromatic polymer foam structure that comprises melting at least one alkenyl aromatic polymer resin. An effective amount of blowing agent mixture is dissolved in the at least one alkenyl aromatic polymer. The blowing agent mixture comprises at least one VOC blowing agent and acetone. The majority by mole percent of the VOC blowing agent is selected from n-butane, iso-butane, propane and combinations thereof. An extrudate is formed comprising the at least one alkenyl aromatic polymer resin, the at least one VOC blowing agent, and acetone. The extrudate comprises less than about 2.7 wt. % of the at least one VOC blowing agent. The extrudate is transferred to an expansion zone and permitted to expand to produce the foam structure. The foam structure has an extruded density less than about 7 lbs/ft3 and a basis weight of less than about 20 grams per 100 in2.Type: GrantFiled: January 3, 2003Date of Patent: January 23, 2007Assignee: Pactiv CorporationInventors: Gary A. Francis, Wen P. Wu
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Patent number: 7147799Abstract: An oxygen scavenging packet containing an iron-based oxygen scavenger and an electrolyte is set forth in which the rate of uptake of oxygen is increased by virtue of the introduction into the packet of an oxygen uptake accelerator containing water. Methods of increasing the rate of oxygen absorption by use of the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: June 13, 2005Date of Patent: December 12, 2006Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6926846Abstract: An oxygen scavenging packet containing an iron-based oxygen scavenger and an electrolyte is set forth in which the rate of uptake of oxygen is increased by virtue of the introduction into the packet of an oxygen uptake accelerator containing water. Methods of increasing the rate of oxygen absorption by use of the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: September 30, 2003Date of Patent: August 9, 2005Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6884450Abstract: A container comprises a substrate and a multi-layer film The substrate has a bottom wall and a continuous base wall in which the continuous base wall encompasses the bottom wall and extends upwardly therefrom. The substrate comprises at least one particulate mineral filler and polypropylene. The multi-layer film is attached to the substrate. The multi-layer film comprises at least a first layer and a second layer The first layer comprises a metallocene-catalyzed polyolefin The second layer comprises polypropylene. The substrate and the multi-layer film are made in the absence of ethylene vinyl alcohol copolymer (EVOH), ethylene vinyl acetate copolymer (EVA), and ethylene methyl acrylate copolymer (EMA).Type: GrantFiled: October 3, 2002Date of Patent: April 26, 2005Assignee: Pactiv CorporationInventors: Wen P. Wu, Tapan Banerjee, Ute Honert, Gary D. Ennis, Mark A. Erickson
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Publication number: 20040132844Abstract: A method for producing an alkenyl aromatic polymer foam structure that comprises melting at least one alkenyl aromatic polymer resin. An effective amount of blowing agent mixture is dissolved in the at least one alkenyl aromatic polymer. The blowing agent mixture comprises at least one VOC blowing agent and acetone. The majority by mole percent of the VOC blowing agent is selected from n-butane, iso-butane, propane and combinations thereof. An extrudate is formed comprising the at least one alkenyl aromatic polymer resin, the at least one VOC blowing agent, and acetone. The extrudate comprises less than about 2.7 wt. % of the at least one VOC blowing agent. The extrudate is transferred to an expansion zone and permitted to expand to produce the foam structure. The foam structure has an extruded density less than about 7 lbs/ft3 and a basis weight of less than about 20 grams per 100 in2.Type: ApplicationFiled: January 3, 2003Publication date: July 8, 2004Inventors: Gary A. Francis, Wen P. Wu
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Publication number: 20040067288Abstract: A container comprises a substrate and a multi-layer film The substrate has a bottom wall and a continuous base wall in which the continuous base wall encompasses the bottom wall and extends upwardly therefrom. The substrate comprises at least one particulate mineral filler and polypropylene. The multi-layer film is attached to the substrate. The multi-layer film comprises at least a first layer and a second layer The first layer comprises a metallocene-catalyzed polyolefin The second layer comprises polypropylene. The substrate and the multi-layer film are made in the absence of ethylene vinyl alcohol copolymer (EVOH), ethylene vinyl acetate copolymer (EVA), and ethylene methyl acrylate copolymer (EMA).Type: ApplicationFiled: October 3, 2002Publication date: April 8, 2004Inventors: Wen P. Wu, Tapan Banerjee, Ute Honert, Gary D. Ennis, Mark A Erickson
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Patent number: 6666988Abstract: An oxygen scavenging packet containing an iron-based oxygen scavenger and an electrolyte is set forth in which the rate of uptake of oxygen is increased by virtue of the introduction into the packet of an oxygen uptake accelerator containing water. Methods of increasing the rate of oxygen absorption by use of the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: November 4, 2002Date of Patent: December 23, 2003Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Publication number: 20030058809Abstract: An oxygen scavenging packet containing an iron-based oxygen scavenger and an electrolyte is set forth in which the rate of uptake of oxygen is increased by virtue of the introduction into the packet of an oxygen uptake accelerator containing water. Methods of increasing the rate of oxygen absorption by use of the iron-based oxygen scavenging packet are also set forth.Type: ApplicationFiled: November 4, 2002Publication date: March 27, 2003Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6508955Abstract: An oxygen scavenging packet containing an iron-based oxygen scavenger and an electrolyte is set forth in which the rate of uptake of oxygen is increased by virtue of the introduction into the packet of an oxygen uptake accelerator containing water. Methods of increasing the rate of oxygen absorption by use of the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: November 12, 1999Date of Patent: January 21, 2003Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6315921Abstract: An iron-based oxygen scavenging packet is set forth in which the rate of uptake of oxygen is increased by virtue of the presence of an oxygen uptake accelerator such as water which is introduced into the packet. Methods of increasing the rate of oxygen absorption by the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: July 2, 1999Date of Patent: November 13, 2001Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6231905Abstract: A packaging system and method utilizes a modified atmosphere package including a first package and a second package. The first package includes a non-barrier portion substantially permeable to oxygen, while the second package is substantially impermeable to oxygen. After a food product such as raw meat is placed within the first package, the first package is sealed and then inserted into the second package without sealing the second package so as to create a pocket between the first and second packages. The system and method first employ an oxygen reduction technique such as evacuation, gas flushing, and/or scavenging to quickly reduce the oxygen level in the pocket to a first non-zero level, and then employ an activated oxygen scavenger to further reduce the oxygen level to zero percent after the package is sealed. The oxygen scavenger is activated with an oxygen uptake accelerator to increase the rate at which the oxygen is absorbed.Type: GrantFiled: October 8, 1998Date of Patent: May 15, 2001Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6183790Abstract: A modified atmosphere packaging method creates a modified atmosphere in a package including an inner package and an outer package. The inner package is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer package is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner package, the inner package is flushed with a desired mixture of gases to substantially remove oxygen from the inner package. The flushed inner package is then sealed and inserted into the outer package without sealing the outer package. Next, the outer package is flushed with the desired mixture of gases to substantially remove oxygen from the outer package. After flushing the outer package, the outer package is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package.Type: GrantFiled: August 27, 1999Date of Patent: February 6, 2001Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6103281Abstract: A packaging system and method utilizes a modified atmosphere package including a first package and a second package. The first package includes a non-barrier portion substantially permeable to oxygen, while the second package is substantially impermeable to oxygen. After a food product such as raw meat is placed within the first package, the first package is sealed and then inserted into the second package without sealing the second package so as to create a pocket between the first and second packages. The system and method first employ an oxygen reduction technique such as evacuation, gas flushing, and/or scavenging to quickly reduce the oxygen level in the pocket to a first non-zero level, and then employ an activated oxygen scavenger to further reduce the oxygen level to zero percent after the package is sealed. The oxygen scavenger is activated with an oxygen uptake accelerator to increase the rate at which the oxygen is absorbed.Type: GrantFiled: October 8, 1998Date of Patent: August 15, 2000Assignee: Tenneco Packaging Inc.Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 5948457Abstract: A modified atmosphere packaging method creates a modified atmosphere in a package including an inner package and an outer package. The inner package is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer package is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner package, the inner package is flushed with a desired mixture of gases to substantially remove oxygen from the inner package. The flushed inner package is then sealed and inserted into the outer package without sealing the outer package. Next, the outer package is flushed with the desired mixture of gases to substantially remove oxygen from the outer package. After flushing the outer package, the outer package is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package.Type: GrantFiled: June 9, 1998Date of Patent: September 7, 1999Assignee: Tenneco Packaging Inc.Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 5928560Abstract: An iron-based oxygen scavenging packet is set forth in which the rate of uptake of oxygen is increased by virtue of the presence of an oxygen uptake accelerator such as water which is introduced into the packet. Methods of increasing the rate of oxygen absorption by the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: May 14, 1997Date of Patent: July 27, 1999Assignee: Tenneco Packaging Inc.Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 5811142Abstract: A modified atmosphere packaging method creates a modified atmosphere in a package including an inner package and an outer package. The inner package is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer package is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner package, the inner package is flushed with a desired mixture of gases to substantially remove oxygen from the inner package. The flushed inner package is then sealed and inserted into the outer package without sealing the outer package. Next, the outer package is flushed with the desired mixture of gases to substantially remove oxygen from the outer package. After flushing the outer package, the outer package is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package.Type: GrantFiled: December 13, 1996Date of Patent: September 22, 1998Assignee: Tenneo PackagingInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 5698250Abstract: A modified atmosphere packaging system and method creates a modified atmosphere in a package including an inner container and an outer container. The inner container is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer container is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner container, the inner container is flushed with a desired mixture of gases to substantially remove oxygen from the inner container. The flushed inner container is then sealed and inserted into the outer container without sealing the outer container. Next, the outer container is flushed with the desired mixture of gases to substantially remove oxygen from the outer container. After flushing the outer container, the outer container is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package.Type: GrantFiled: April 3, 1996Date of Patent: December 16, 1997Assignee: Tenneco Packaging Inc.Inventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu