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).

  • Patent number: 8758642
    Abstract: 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: Grant
    Filed: August 14, 2013
    Date of Patent: June 24, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas Joseph Leck, Howard S Hammel
  • Publication number: 20130327996
    Abstract: 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: Application
    Filed: August 14, 2013
    Publication date: December 12, 2013
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas Joseph Leck, Howard S. Hammel
  • Patent number: 8535557
    Abstract: 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: Grant
    Filed: September 5, 2012
    Date of Patent: September 17, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas Joseph Leck, Howard S Hammel, Nancy Lynn Tucker
  • Publication number: 20120326105
    Abstract: 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: Application
    Filed: September 5, 2012
    Publication date: December 27, 2012
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas J. Leck, Howard S. Hammel, Nancy Lynn Tucker
  • Patent number: 8293131
    Abstract: 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: Grant
    Filed: August 17, 2011
    Date of Patent: October 23, 2012
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Publication number: 20110297901
    Abstract: 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: Application
    Filed: August 17, 2011
    Publication date: December 8, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Patent number: 8021569
    Abstract: 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: Grant
    Filed: December 7, 2010
    Date of Patent: September 20, 2011
    Assignee: E.I. Du Pont Nemours and Company
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Publication number: 20110147644
    Abstract: 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: Application
    Filed: December 7, 2010
    Publication date: June 23, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Patent number: 7867410
    Abstract: 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: Grant
    Filed: June 22, 2009
    Date of Patent: January 11, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Publication number: 20090278097
    Abstract: 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: Application
    Filed: June 22, 2009
    Publication date: November 12, 2009
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas J Leck, Howard S. Hammel
  • Patent number: 7560044
    Abstract: 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: Grant
    Filed: November 12, 2004
    Date of Patent: July 14, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Howard S. Hammel
  • Patent number: 5532284
    Abstract: 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: Grant
    Filed: February 17, 1995
    Date of Patent: July 2, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
  • Patent number: 5516811
    Abstract: 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: Grant
    Filed: April 24, 1995
    Date of Patent: May 14, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
  • Patent number: 5439947
    Abstract: 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: Grant
    Filed: November 9, 1992
    Date of Patent: August 8, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip L. Bartlett, Joseph A. Creazzo, Howard S. Hammel
  • Patent number: 5134171
    Abstract: Closed cell rigid polyhydroxy acid resin compositions foamed with environmentally benign, which compositions are degradable and cause minimal environmental impact when discarded.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: July 28, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Howard S. Hammel, Robert O. York