Patents by Inventor Howard S. Hammel
Howard S. Hammel 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: 8758642Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: August 14, 2013Date of Patent: June 24, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Thomas Joseph Leck, Howard S Hammel
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Publication number: 20130327996Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: ApplicationFiled: August 14, 2013Publication date: December 12, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Thomas Joseph Leck, Howard S. Hammel
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Patent number: 8535557Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: September 5, 2012Date of Patent: September 17, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Thomas Joseph Leck, Howard S Hammel, Nancy Lynn Tucker
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Publication number: 20120326105Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: ApplicationFiled: September 5, 2012Publication date: December 27, 2012Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: Thomas J. Leck, Howard S. Hammel, Nancy Lynn Tucker
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Patent number: 8293131Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: August 17, 2011Date of Patent: October 23, 2012Assignee: E I du Pont de Nemours and CompanyInventors: Thomas J. Leck, Howard S. Hammel
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Publication number: 20110297901Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: ApplicationFiled: August 17, 2011Publication date: December 8, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Thomas J. Leck, Howard S. Hammel
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Patent number: 8021569Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: December 7, 2010Date of Patent: September 20, 2011Assignee: E.I. Du Pont Nemours and CompanyInventors: Thomas J. Leck, Howard S. Hammel
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Publication number: 20110147644Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: ApplicationFiled: December 7, 2010Publication date: June 23, 2011Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Thomas J. Leck, Howard S. Hammel
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Patent number: 7867410Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: June 22, 2009Date of Patent: January 11, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Thomas J. Leck, Howard S. Hammel
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Publication number: 20090278097Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: ApplicationFiled: June 22, 2009Publication date: November 12, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Thomas J Leck, Howard S. Hammel
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Patent number: 7560044Abstract: The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.Type: GrantFiled: November 12, 2004Date of Patent: July 14, 2009Assignee: E. I. du Pont de Nemours and CompanyInventors: Thomas J. Leck, Howard S. Hammel
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Patent number: 5532284Abstract: An improved closed cell polymer foam and foaming agent involving the use of a halocarbon blowing agent (e.g., HCFC-22, HCFC-123, HCFC-123a, and HCFC-141b) in combination with an effective amount of a gas barrier resin (e.g., an ethylene/vinyl acetate copolymer, ethylene/acrylic ester copolymer or acrylic ester polymer) uniformly dispersed in the continuous polymeric phase. The presence of the gas barrier resin is shown to significantly reduce the escape of blowing agent from and/or entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.Type: GrantFiled: February 17, 1995Date of Patent: July 2, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
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Patent number: 5516811Abstract: An improved closed-cell polymer foam involves the use of a polyfluorocarbon forming agent (e.g., HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e.g., organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.Type: GrantFiled: April 24, 1995Date of Patent: May 14, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
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Patent number: 5439947Abstract: An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e.g., HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e.g., organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.Type: GrantFiled: November 9, 1992Date of Patent: August 8, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
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Patent number: 5134171Abstract: Closed cell rigid polyhydroxy acid resin compositions foamed with environmentally benign, which compositions are degradable and cause minimal environmental impact when discarded.Type: GrantFiled: January 27, 1992Date of Patent: July 28, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Howard S. Hammel, Robert O. York