Patents by Inventor George J. Papakonstantopoulos

George J. Papakonstantopoulos 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).

  • Random copolymer oil return agents
    Patent number: 9062236
    Abstract: The present invention relates to polymeric oil-return agents which solubilize or disperse mineral oil and/or synthetic oil lubricants with hydrofluorocarbon, hydrochlorofluorocarbon, and hydrofluoroolefin-based refrigerants and refrigerant compositions containing them. The polymeric oil-return agents are random copolymers containing less than about 30 wt % fluorine and produced from at least one monomer providing compatibility with the oil phase and at least one monomer providing compatibility with the refrigerant phase. The polymeric oil-return agents provide for more efficient return of mineral oil and/or synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: June 23, 2015
    Assignee: Arkema Inc.
    Inventors: Brett L. Van Horn, Christopher A. Bertelo, Scott C. Schmidt, Noah E. Macy, George J. Papakonstantopoulos
  • Block copolymer oil return agents
    Patent number: 8623235
    Abstract: The present invention relates to fluorine free polymeric oil-return agents that increase the miscibility of lubricants such as mineral oils and/or oxygenated lubricants with refrigerants in order to improve oil return and system performance of refrigeration systems. It was discovered that fluorine free block copolymers having a block compatible with the oil phase, and at least one block compatible with the refrigerant phase can effectively compatibilize lubricating oils with HFC and HFO refrigerants.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: January 7, 2014
    Assignee: Arkema Inc.
    Inventors: Brett L. Van Horn, Christopher A. Bertelo, Scott C. Schmidt, Noah E. Macy, George J. Papakonstantopoulos
  • RANDOM COPOLYMER OIL RETURN AGENTS
    Publication number: 20120223269
    Abstract: The present invention relates to polymeric oil-return agents which solubilize or disperse mineral oil and/or synthetic oil lubricants with hydrofluorocarbon, hydrochlorofluorocarbon, and hydrofluoroolefin-based refrigerants and refrigerant compositions containing them. The polymeric oil-return agents are random copolymers containing less than about 30 wt % fluorine and produced from at least one monomer providing compatibility with the oil phase and at least one monomer providing compatibility with the refrigerant phase. The polymeric oil-return agents provide for more efficient return of mineral oil and/or synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system.
    Type: Application
    Filed: October 27, 2010
    Publication date: September 6, 2012
    Applicant: Arkema Inc.
    Inventors: Brett L. Van Horn, Christopher A. Bertelo, Scott C. Schmidt, Noah E. Macy, George J. Papakonstantopoulos
  • BLOCK COPOLYMER OIL RETURN AGENTS
    Publication number: 20110006248
    Abstract: The present invention relates to fluorine free polymeric oil-return agents that increase the miscibility of lubricants such as mineral oils and/or oxygenated lubricants with refrigerants in order to improve oil return and system performance of refrigeration systems. It was discovered that fluorine free block copolymers having a block compatible with the oil phase, and at least one block compatible with the refrigerant phase can effectively compatibilize lubricating oils with HFC and HFO refrigerants.
    Type: Application
    Filed: February 18, 2009
    Publication date: January 13, 2011
    Applicant: Akerna Inc.
    Inventors: Brett L. Van Horn, Christopher A. Bertelo, Scott C. Schmidt, Noah E. Macy, George J. Papakonstantopoulos