Patents by Inventor Thomas J. Leck

Thomas J. Leck 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: 8871112
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises 2,3,3,3-tetrafluoropropene (HFC-1234yf) and at least one hydrocarbon. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, and aerosol propellants.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: October 28, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Thomas J. Leck, Donald Bernard Bivens, Akimichi Yokozeki
  • Patent number: 8668791
    Abstract: The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one ascorbic acid, terephthalate, or nitromethane, or mixtures thereof. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: March 11, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Jon Lee Howell
  • Patent number: 8663494
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be a terpene, terpenoid or fullerene; or a mixture of a terpene, terpenoid or fullerene with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: March 4, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Jon Lee Howell, Velliyur Nott Mallikarjuna Rao, Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Ekaterina N. Swearingen, Andrew Edward Feiring
  • Patent number: 8562853
    Abstract: The present invention relates to the field of compression refrigeration and air conditioning. Specifically, the present invention relates to a tracer-containing compositions comprising refrigeration/heating fluid and tracer compound(s). Additionally, the present invention relates to a method for detecting tracer compounds to identify gases after leaving the custody of the original manufacturer or prior source, and the verification of authenticity. The aforementioned method provides for the detection of tracer compounds, which in turn, may alert the refrigeration industry to when dilution, adulteration, contamination or other unauthorized practices have occurred with refrigeration products.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: October 22, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Stuart C. Bricker, Allen Capron Sievert
  • Patent number: 8535556
    Abstract: The present invention relates to compositions comprising iodotrifluoromethane and an effective amount of at least one stabilizer selected from the group consisting of hindered phenols, thiophosphates, butylated triphenylphosphorothionates, organo phosphates, phosphites, aryl alkyl ethers, terpenes, terpenoids, epoxides, fluorinated epoxides, oxetanes, ascorbic acid, thiols, lactones, thioethers, amines, nitromethane, alkylsilanes, benzophenone derivatives, aryl sulfides, divinyl terephalic acid, diphenyl terephalic acid, ionic liquids, and mixtures thereof. These stabilized iodotrifluoromethane compositions may be useful as working fluids in multiple applications including cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: September 17, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Nandini C. Mouli, Jon Lee Howell, Velliyur Nott Mallikarjuna Rao, Andrew Edward Feiring, Viacheslav A. Petrov, Allen Capron Sievert, Mario Joseph Nappa, Barbara Haviland Minor, Ekaterina N. Swearingen, Schmitz Corneille, Deepak Perti
  • Patent number: 8535555
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be an epoxide, fluorinated epoxide or oxetane, or a mixture thereof with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: September 17, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Andrew Edward Feiring, Viacheslav A. Petrov, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Thomas J. Leck, Jon Lee Howell
  • Patent number: 8529786
    Abstract: The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one phosphorus-containing compound selected from the group consisting of thiophosphates, butylated triphenylphosphorothionates, and organophosphates. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: September 10, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Nandini C. Mouli, Barbara Haviland Minor, Mario Joseph Nappa, Jon Lee Howell
  • Patent number: 8496846
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be at least one phenol or a mixture of at least one phenol with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: July 30, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Mario Joseph Nappa, Barbara Haviland Minor, Thomas J. Leck, Nandini C. Mouli
  • Patent number: 8426657
    Abstract: The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity, or energy efficiency of a refrigeration, air conditioning or heat transfer system.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: April 23, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Thomas Frank Saturno, Gregory A. Bell
  • Patent number: 8394286
    Abstract: The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one thiol or thioether, or mixtures thereof. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: March 12, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli
  • Patent number: 8383004
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be an amine or a mixture of an amine with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: February 26, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Nandini C. Mouli, Barbara Haviland Minor, Mario Joseph Nappa, Thomas J. Leck
  • 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: 20120216551
    Abstract: The present invention relates to a cascade refrigeration system which circulates a refrigerant comprising a fluoroolefin therethrough. The cascade refrigeration system includes a low temperature refrigeration loop and a medium temperature refrigeration loop. The fluoroolefin circulates through either loop, or both. In a particular embodiment, the fluoroolefin circulates through the medium temperature loop. In a particular embodiment, where the cascade refrigeration system includes a first and a second cascade heat exchanger, and a secondary heat transfer loop which extends between the first and second cascade heat exchangers, either the first and/or second refrigerant may be, but need not necessarily be, a fluoroolefin.
    Type: Application
    Filed: November 3, 2010
    Publication date: August 30, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Barbara Haviland Minor, Konstantinos Kontomaris, Thomas J. Leck
  • Patent number: 8188323
    Abstract: The present invention relates to compositions and processes of using perfluoropolyether to maintain or improve the oil return, lubrication, cooling capacity or energy efficiency of the refrigeration, air conditioning and heat transfer system.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: May 29, 2012
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Thomas J. Leck, Thomas Frank Saturno, Gregory A. Bell
  • Publication number: 20120085110
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be a terpene, terpenoid or fullerene; or a mixture of a terpene, terpenoid or fullerene with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Application
    Filed: December 14, 2011
    Publication date: April 12, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: JON LEE HOWELL, Velliyur Nott Mallikarjuna Rao, Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Ekaterina N. Swearingen, Andrew Edward Feiring
  • Publication number: 20120074349
    Abstract: The present disclosure relates to compositions comprising at least one fluoroolefin and an effective amount of a stabilizer comprising at least one ascorbic acid, terephthalate, or nitromethane, or mixtures thereof. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Application
    Filed: December 7, 2011
    Publication date: March 29, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Thomas J. LECK, Barbara Haviland MINOR, Mario Joseph NAPPA, Nandini C. MOULI, Jon Lee HOWELL
  • Publication number: 20120047925
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be at least one phenol or a mixture of at least one phenol with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Application
    Filed: November 4, 2011
    Publication date: March 1, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: VELLIYUR NOTT MALLIKARJUNA RAO, MARIO JOSEPH NAPPA, BARBARA HAVILAND MINOR, THOMAS J. LECK, NANDINI C. MOULI
  • Publication number: 20120042669
    Abstract: Disclosed herein are chiller apparatus containing cis-HFO-1336mzz. These chillers may be centrifugal chillers or positive displacment (e.g., screw) chillers and may comprise flooded evaporators or direct expansion evaporators. Also disclosed herein are methods for producing cooling comprising evaporating cis-HFO-1336mzz in the vicinity of a body to be cooled.
    Type: Application
    Filed: June 3, 2010
    Publication date: February 23, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Barbara Haviland Minor, Konstantinos Kontomaris, Thomas J. Leck
  • Patent number: 8101094
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be a terpene, terpenoid or fullerene; or a mixture of a terpene, terpenoid or fullerene with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: January 24, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Jon Lee Howell, Velliyur Nott Mallikarjuna Rao, Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Ekaterina Swearingen, Andrew Edward Feiring