Patents by Inventor Allen C. Sievert
Allen C. Sievert 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: 7208099Abstract: Disclosed herein are 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane refrigerant or heat transfer fluid compositions further comprising at least one hydrofluorocarbon, which are useful in refrigeration or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage or other multi-stage centrifugal compressors or single slab single pass heat exchangers.Type: GrantFiled: December 16, 2004Date of Patent: April 24, 2007Assignee: E. I. du Pont de Nemours & CompanyInventors: Barbara Haviland Minor, Mario J. Nappa, Allen C. Sievert
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Patent number: 7208100Abstract: Disclosed here in are refrigerant or heat transfer fluid compositions comprising C4F9OC2H5 compositions and at least one hydrofluoroether, which are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab single pass heat exchangers.Type: GrantFiled: December 16, 2004Date of Patent: April 24, 2007Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barbara Haviland Minor, Mario J. Nappa, Allen C. Sievert
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Patent number: 7201855Abstract: Disclosed herein are 1,1,1,3,3-pentafluorobutane refrigerant or heat transfer fluid compositions further comprising fluoroether, which are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab single pass heat exchangers.Type: GrantFiled: January 30, 2006Date of Patent: April 10, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Barbara Haviland Minor, Mario J. Nappa, Allen C. Sievert
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Patent number: 7161049Abstract: A process is disclosed for purifying a hydrofluoropropane of undesirable C2–C4 olefinic and C1–C4 saturated chlorinated impurities, comprising the steps of: contacting a first mixture of hydrofluoropropane, olefinic impurity and saturated chlorinated impurity with hydrogen and hydrogen fluoride concurrently in the presence of a bifunctional catalyst, for example an alloy of gold and palladium supported on carbon, capable of catalyzing hydrogenation and fluorination. During the contacting step, olefinic impurity is converted to saturated hydrogenated derivative and/or saturated hydrofluorinated derivative, and saturated chlorinated impurity is converted to a saturated hydrodechlorinated derivative and/or saturated fluorinated derivative. The hydrofluoropropane thus formed is substantially free of both the olefinic and saturated chlorinated impurities and may be used as obtained or subject to further purification steps such as distillation to remove the process derivatives (e.g.Type: GrantFiled: December 11, 2003Date of Patent: January 9, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Velliyur Nott Mallikarjuna Rao, Allen C. Sievert
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Patent number: 7153448Abstract: Disclosed herein are refrigerant and heat transfer fluid compositions comprising 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone and at least one hydrofluorocarbon for use in refrigeration and air conditioning systems employing a centrifugal compressor. The compositions may be azeotropic or near-azeotropic.Type: GrantFiled: February 22, 2005Date of Patent: December 26, 2006Assignee: E.I. du Pont de Nemours and CompanyInventors: Barbara Haviland Minor, Mario J. Nappa, Allen C. Sievert, Thomas J. Leck
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Patent number: 7129383Abstract: A process for the preparation of 2-chloro-1,1,1,3,3,3-heptafluoropropane is disclosed which involves (a) contacting a mixture comprising hydrogen fluoride, chlorine, and at least one starting material selected from the group consisting of halopropenes of the formula CX3CCI?CX2 and halopropanes of the formula the CX3CCIYCX3, wherein each X is independently F or Cl, and Y is H, Cl or F (provided that the number of X and Y which are F totals no more than six) with a chlorofluorination catalyst in a reaction zone to produce a product mixture comprising CF3CCIFCF3, HCI, HF. and underfluorinated halogenated hydrocarbon intermediates. The process is characterized by said chlorofluorination catalyst comprising at least one chromium-containing component selected from (i) a crystalline alpha-chromium oxide where at least 0.Type: GrantFiled: August 21, 2003Date of Patent: October 31, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Mario J. Nappa, Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Sekhar Subramoney, Munirpallam A. Subramanian, Allen C. Sievert
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Patent number: 7122704Abstract: The present invention relates to new fluoroketone compounds from the groups monobromoperfluoroketones, monohydromonobromoperfluoroketones, (perfluoroalkoxy)monobromoperfluoroketones, (fluoroalkoxy)monobromoperfluoroketones, and monochloromonobromoperfluoroketones. These fluoroketone compounds have utility in preventing, controlling and extinguishing fire. These fluoroketone compounds have further utility as additives to reduce or eliminate the flammability of normally flammable working fluids such as refrigerants, foam blowing agents, solvents, aerosol propellants, and sterilants.Type: GrantFiled: June 18, 2004Date of Patent: October 17, 2006Assignee: E.I. du Pont de Nemours and CompanyInventors: Mario J. Nappa, Velliyur Nott Mallikarjuna Rao, Allen C. Sievert
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Patent number: 7087788Abstract: The present invention relates to new fluorosulfone compounds. These fluorosulfone compounds have utility in preventing, controlling and extinguishing fire.Type: GrantFiled: August 11, 2004Date of Patent: August 8, 2006Assignee: E.I. du Pont de Nemours and CompanyInventors: Allen C. Sievert, Mario J. Nappa, Velliyur Nott Mallikarjuna Rao, Paul R. Resnick
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Patent number: 7074973Abstract: A process for the preparation of pentafluoroethane is disclosed which involves contacting a mixture comprising hydrogen fluoride and at least one starting material selected from haloethanes of the formula CX3CHX2 and haloethanes of the formula CX2?CX2, where each X is independently selected from the group consisting of F and Cl (provided that no more than four of X are F), with a fluorination catalyst in a reaction zone to produce a product mixture comprising HF, HCl, pentafluoroethane, underfluorinated halogenated hydrocarbon intermediates and less than 0.2 mole percent chloropentafluoroethane based on the total moles of halogenated hydrocarbons in the product mixture. The process is characterized by the fluorination catalyst comprising (i) a crystalline cobalt-substituted alpha-chromium oxide where from about 0.05 atom % to about 6 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by trivalent cobalt (Co+3) and/or (ii) a fluorinated crystalline oxide of (i).Type: GrantFiled: August 21, 2003Date of Patent: July 11, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Mario J. Nappa, Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Shekhar Subramoney, Munirpallam A. Subramanian, Allen C. Sievert
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Patent number: 7029599Abstract: Disclosed herein are 1,1,1,3,3-pentafluorobutane refrigerant or heat transfer fluid compositions further comprising fluoroether, which are useful in refrigerain or air conditioning apparatus or as heat transfer fluids. The compositions of the present invention are also useful in centrifugal compressor apparatus that employ two-stage compressors or single slab.single pass heat exchangers.Type: GrantFiled: December 16, 2004Date of Patent: April 18, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Barbara Haviland Minor, Mario J. Nappa, Allen C. Sievert
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Publication number: 20040236161Abstract: The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO3 and H2SO4 in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phosphorous oxyacid salt, and (ii) recovering the fluorinated hydrocarbon having reduced concentration of, or substantially free of, said acidic contaminant, provided that said fluorinated hydrocarbon is not CF3CH2CF3 or CF3CHFCF3.Type: ApplicationFiled: May 23, 2003Publication date: November 25, 2004Inventors: Velliyur Nott Mallikarjuna Rao, Allen C. Sievert
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Publication number: 20040167366Abstract: A process is disclosed for purifying a hydrofluoropropane of undesirable C2-C4 olefinic and C1-C4 saturated chlorinated impurities, comprising the steps of: contacting a first mixture of hydrofluoropropane, olefinic impurity and saturated chlorinated impurity with hydrogen and hydrogen fluoride concurrently in the presence of a bifunctional catalyst, for example an alloy of gold and palladium supported on carbon, capable of catalyzing hydrogenation and fluorination. During the contacting step, olefinic impurity is converted to saturated hydrogenated derivative and/or saturated hydrofluorinated derivativ, and saturated chlorinated impurity is converted to a saturated hydrodechlorinated derivative and/or saturated fluorinated derivative. The hydrofluoropropane thus formed is substantially free of both the olefinic and saturated chlorinated impurities and may be used as obtained or subject to further purification steps such as distillation to remove the process derivatives (e.g.Type: ApplicationFiled: December 11, 2003Publication date: August 26, 2004Inventors: Velliyur Nott Mallikarjuna Rao, Allen C. Sievert
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Patent number: 5605882Abstract: This invention relates to compositions that include at least one fluoroether and at least one hydrofluorocarbon. Included in this invention are compositions of a cyclic or acyclic hydrofluoroether of the formula C.sub.a F.sub.b H.sub.2a+2-b O.sub.c wherein a=2 or 3 and 3.ltoreq.b.ltoreq.8 and c=1 or 2 and a hydrofluorocarbon of the formula C.sub.n F.sub.m H.sub.2n+2-m wherein 1.ltoreq.n.ltoreq.4 and 1.ltoreq.m.ltoreq.8. Such compositions may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents.Type: GrantFiled: March 5, 1993Date of Patent: February 25, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Diana L. Klug, Barbara H. Minor, Donna M. Patron, Tuneen E. C. Chisolm, Allen C. Sievert
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Patent number: 5565081Abstract: This invention relates to chemical processes for preparing tetrafluoropropionate salts and selected derivatives thereof.Type: GrantFiled: April 29, 1994Date of Patent: October 15, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Carl G. Krespan, Allen C. Sievert
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Patent number: 5562853Abstract: Compositions include compositions of 1,1,2,2,3,3,4,4-octafluorobutane and a hydrocarbon having from 3 to 7 carbon atoms. Specific examples include 1,1,2,2,3,3,4,4-octafluorobutane and butane, cyclopropane, isobutane, propane, cyclopentane, 2,2-dimethylbutane, n-pentane, 2-methylbutane, cyclohexane, 2,3-dimethylpentane, 3-ethylpentane, heptane, hexane or methylcyclopentane. Also included in this invention are compositions of 1,1,2,2,3,3,4,4-octafluorobutane and ethyl formate, propylene oxide, bis(pentafluoroethyl)sulfide, dimethoxyethane or tetrahydrofuran. These compositions, which may be azeotropic or azeotrope-like, may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents or displacement drying agents.Type: GrantFiled: September 29, 1994Date of Patent: October 8, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barbara H. Minor, Allen C. Sievert
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Patent number: 5523501Abstract: A process is disclosed for the catalytic hydrogenolysis of at least one starting material selected from saturated acyclic halofluorocarbons and hydrohalofluorocarbons containing three or four carbon atoms, and from one to five non-fluorine halogens (each non-fluorine halogen being independently chlorine or bromine) wherein all non-fluorine halogen substituents are contained on end carbons. The process involves reacting the starting material with hydrogen at an elevated temperature of about 300.degree. C. or less in the presence of a catalyst containing a catalytically effective amount of palladium supported on carbon to produce a hydrogenolysis product wherein over 80 mole percent of the hydrogenolysis product is a saturated compound having the same distribution of fluorine substituents as the starting material. The carbon support has an ash content of less than about 0.5% by weight.Type: GrantFiled: December 22, 1994Date of Patent: June 4, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Carl S. Kellner, V. N. Mallikarjuna Rao, Allen C. Sievert
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Patent number: 5488189Abstract: The instant invention relates to producing fluorinated propanes and pentanes. More particularly it relates to producing perhalofluoropropanes and pentanes by reacting dihalodifluoromethanes with polyfluoroethylenes, notably tetrafluoroethylene (TFE) and chlorotrifluoroethylene (CTFE) while in the presence of an aluminum chlorofluoride catalyst.Type: GrantFiled: December 14, 1993Date of Patent: January 30, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Allen C. Sievert, Mario J. Nappa
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Patent number: 5474696Abstract: Producing refrigeration by evaporating the fluorocarbon refrigerants 1,1,1,2- and 1,1,2,2-tetrafluoro-2-(difluoromethoxy)ethane in the vicinity of a body to be cooled.Type: GrantFiled: November 10, 1994Date of Patent: December 12, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Donna M. Patron, Allen C. Sievert
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Patent number: 5430206Abstract: A method of recovering pure dichloropentafluoropropane from a mixture of dichloropentaflouropropane and chloroform (including breaking the azeotropic mixture thereof) involving selectively fluorinating the chloroform to the lower boiling dichloromonofluoromethane and then distilling to separate and recover pure dichloropentafluoropropane.Type: GrantFiled: October 25, 1991Date of Patent: July 4, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Abid N. Merchant, Allen C. Sievert
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Patent number: 5414165Abstract: A process is disclosed for producing 1,1,1,3,3,3-hexafluoropropane with high selectivity. 1,1,1,3,3,3-hexachloropropane is contacted with hydrogen fluoride in the vapor phase at a temperature of from about 200.degree. C. to 400.degree. C. in the presence of a catalyst comprising trivalent chromium, to produce a fluorinated product containing CF.sub.3 CH.sub.2 CF.sub.3 and its haloprecursors (i.e., compounds which may be recycled for further reaction with HF) with a total selectivity of at least about 95 percent; and a sufficient amount of said haloprecursors is reacted with hydrogen fluoride in the vapor phase at a temperature of from 200.degree. C. to 400.degree. C. in the presence of a catalyst comprising trivalent chromium to provide an overall selectivity to 1,1,1,3,3,3-hexafluoropropane of at least about 95 percent based upon the amount of 1,1,1,3,3,3-hexachloropropane initially reacted with HF.Type: GrantFiled: July 29, 1994Date of Patent: May 9, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Mario J. Nappa, Allen C. Sievert