Patents by Inventor Donald Bernard Bivens

Donald Bernard Bivens 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).

  • Hydrofluorocarbon compositions with tetrafluoroethane and cyclopropane
    Patent number: 5785883
    Abstract: Refrigerant compositions include mixtures of difluoromethane and isobutane, butane, propylene or cyclopropane; pentafluoroethane and propylene or cyclopropane; 1,1,2,2-tetrafluoroethane and propane; 1,1,1,2-tetrafluoroethane and cyclopropane; 1,1,1-trifluoroethane and DME or propylene; 1,1-difluoroethane and propane, isobutane, butane or cyclopropane; fluoroethane and propane or cyclopropane; 1,1,1,2,2,3,3-heptafluoropropane and butane, cyclopropane, DME, isobutane or propane; or 1,1,1,2,3,3,3-heptafluoropropane and butane, cyclopropane, isobutane or propane.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: July 28, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Donald Bernard Bivens, Brooks Shawn Lunger
  • Azeotrope-like compositions containing difluoromethane, pentafluoroethane, and carbon dioxide
    Patent number: 5744052
    Abstract: Refrigerant compositions are disclosed which are non-flammable when vapor charged and which perform as well as compositions of 50 weight percent difluoromethane and 50 weight percent pentafluoroethane.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: April 28, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Donald Bernard Bivens
  • Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane
    Patent number: 5725791
    Abstract: The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams, are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: March 10, 1998
    Assignee: E. I. du pont de Nemours and Company
    Inventors: Donald Bernard Bivens, Brooks Shawn Lunger, Akimichi Yokozeki
  • Hydrofluorocarbon compositions
    Patent number: 5672293
    Abstract: Refrigerant compositions include mixtures of difluoromethane and isobutane, butane, propylene or cyclopropane; pentafluoroethane and propylene or cyclopropane; 1,1,2,2-tetrafluoroethane and propane; 1,1,1,2-tetrafluoroethane and cyclopropane; 1,1,1-trifluoroethane and DME or propylene; 1,1-difluoroethane and propane, isobutane, butane or cyclopropane; fluoroethane and propane or cyclopropane; 1,1,1,2,2,3,3-heptafluoropropane and butane, cyclopropane, DME, isobutane or propane; or 1,1,1,2,3,3,3-heptafluoropropane and butane, cyclopropane, isobutane or propane.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: September 30, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Donald Bernard Bivens, Brooks Shawn Lunger
  • Use of 1,1,1,3,3,3-Hexafluoropropane in centrifugal compressors
    Patent number: 5662825
    Abstract: 1,1,1,3,3,3-Hexafluoropropane is disclosed as a refrigerant.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: September 2, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald Bernard Bivens, Richard Edward Fernandez, Mark Brandon Shiflett, Tuneen Chisolm-Carter
  • Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane and (iso) butane
    Patent number: 5648017
    Abstract: The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams, are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 15, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip Lee Bartlett, Donald Bernard Bivens, Brooks Shawn Lunger, Akimichi Yokozeki