Patents by Inventor David C. England
David C. England 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: 4608206Abstract: Compounds having the formula: ##STR1## where X is F or Cl, and a process for the preparation of such compounds.Type: GrantFiled: June 26, 1981Date of Patent: August 26, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventors: David C. England, Edward G. Howard, Jr.
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Patent number: 4594399Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.Type: GrantFiled: March 12, 1985Date of Patent: June 10, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventors: Burton C. Anderson, David C. England, Paul R. Resnick
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Patent number: 4565855Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.Type: GrantFiled: October 29, 1984Date of Patent: January 21, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventors: Burton C. Anderson, David C. England, Paul R. Resnick
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Patent number: 4496750Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.Type: GrantFiled: September 13, 1982Date of Patent: January 29, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventors: Burton C. Anderson, David C. England, Paul R. Resnick
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Patent number: 4487668Abstract: Fluorinated ion exchange polymers which have pendant side chains which contain ##STR1## groups wherein W is F or CF.sub.3, and R is an ionizable group, or which have such pendant side chains and also pendant side chains which contain sulfonyl groups, when used in the form of membranes to separate the anode and cathode compartments of an electrolysis cell, permit operation at high current efficiency. They can be made by copolymerization of a mixture of monomers, one of which is a vinyl monomer which contains the indicated carboxylic functional group.Type: GrantFiled: August 25, 1983Date of Patent: December 11, 1984Assignee: E. I. Du Pont de Nemours and CompanyInventors: David C. England, Paul R. Resnick
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Patent number: 4429143Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.Type: GrantFiled: September 28, 1981Date of Patent: January 31, 1984Assignee: E. I. Du Pont de Nemours & Co.Inventors: Burton C. Anderson, David C. England, Paul R. Resnick
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Patent number: 4357282Abstract: Fluorinated carbonyl compounds are prepared by contacting a fluorinated methyl or ethyl ether containing at least one methoxylated carbon atom-containing group selected from: --CF.sub.2 OR.sup.3, .dbd.CFOR.sup.3, ##STR1## wherein R.sup.3 is CH.sub.3 or C.sub.2 H.sub.5, with a catalyst selected from:SbX.sub.5, TaX.sub.5, NbX.sub.5, AsX.sub.5, BiX.sub.5, TiX.sub.4, ZrX.sub.4, HfX.sub.4, FeX.sub.3,mixtures of SbX.sub.3 and SbX.sub.5, ZM'X'.sub.6, and mixtures of ZM'X'.sub.6 and M'X.sub.5 where X, independently, is F, Cl, Br or I, X' is F or Cl; and Z is H, NO, O.sub.2, alkali metal or NY.sub.4 where Y, independently, is H or alkyl of 1 to 6 carbon atoms, and M' is Sb or As at a temperature of -20.degree. to 200.degree. C.Type: GrantFiled: April 3, 1981Date of Patent: November 2, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventors: Daniel G. Anderson, David C. England, Alwin S. Milian, Jr.
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Patent number: 4316986Abstract: Carboxylic ester and acyl fluoride groups are interchanged in the presence of a metal fluoride catalyst or a metal fluoride/strong sulfonic acid catalyst combination to produce fluorinated mono- and diacyl fluorides.Type: GrantFiled: September 23, 1980Date of Patent: February 23, 1982Assignee: E. I. DuPont de Nemours & CompanyInventors: David C. England, Robert L. Kraft, Carl G. Krespan
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Patent number: 4299949Abstract: Compounds having the formula: ##STR1## where X is F or Cl, a process for the preparation of such compounds, addition copolymers of such compounds with other ethylenically unsaturated monomers, the process of preparation of such copolymers, and derivatives of such copolymers obtained by reaction of the acid halide groups and other compounds.Type: GrantFiled: November 16, 1979Date of Patent: November 10, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventors: David C. England, Edward G. Howard, Jr.
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Patent number: 4247713Abstract: Alkyl perfluoro-.omega.-fluoroformyl esters are provided which have the formula: ##STR1## wherein R is alkyl of 1-6 carbon atoms, andn is 0-6 (preferably 0).compounds where n is 0 are prepared by contacting SO.sub.3 with a compound of the formula ROOC--CF.sub.2 --CF.sub.2 --OR.sup.1. Compounds where n is 1-6 are prepared by contacting a compound where n is 0 with hexafluoropropylene oxide.Type: GrantFiled: August 17, 1978Date of Patent: January 27, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: David C. England
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Patent number: 4206138Abstract: Hexafluoropropene is reacted with liquid sulfur trioxide in the presence of boric oxide, boron trichloride, boron trifluoride, tri(lower alkyl) borate, boron trioxychloride or boron trioxyfluoride at from 0.degree. C. to 150.degree. C. to form perfluoroallyl fluorosulfate and the sultone thereof. The perfluoroallyl fluorosulfate can be homopolymerized or copolymerized with various fluoroethylenes to form resins useful as ion exchange resins or catalysts. The fluorosulfate groups on the resins can be hydrolyzed to form carboxylic acid groups or various corresponding salts. The sultone of perfluoroallyl fluorosulfate can be rearranged to form .beta.-fluorocarbonyl-.beta.-fluorosulfonyl-trifluorethyl fluorosulfate.Type: GrantFiled: August 8, 1978Date of Patent: June 3, 1980Assignee: E. I. Du Pont de Nemours and CompanyInventor: David C. England
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Patent number: 4138430Abstract: Acrylic products are produced in high yields by a catalytic process in which a vaporous mixture of 1-propanol and oxygen are contacted in rapid sequence with (1) a dehydration catalyst and (2) an oxidation catalyst.Type: GrantFiled: September 28, 1977Date of Patent: February 6, 1979Assignee: E. I. Du Pont de Nemours and CompanyInventors: Alvin B. Stiles, David C. England
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Patent number: 4138426Abstract: Alkyl perfluoro-.omega.-fluoroformyl esters are provided which have the formula ##STR1## wherein R is alkyl of 1-6 carbon atoms, and N IS 0-6 (PREFERABLY 0).Compounds where n is 0 are prepared by contacting SO.sub.3 with a compound of the formulaROOC--CF.sub.2 --CF.sub.2 --OR.sup.1.Compounds where n is 1-6 are prepared by contacting a compound where n is 0 with hexafluoropropylene oxide.Also provided are polymerizable monomers having the formula ##STR2## wherein Y is --COOR, --COOH, --COOM or --CN, where M is an alkali metal, ammonium or quaternary ammonium and p is 1-5, prepared from alkyl perfluoro-.omega.-fluoroformyl esters of this invention.Type: GrantFiled: January 11, 1978Date of Patent: February 6, 1979Assignee: E. I. Du Pont de Nemours and CompanyInventor: David C. England
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Patent number: 4137271Abstract: Acrylic products are produced in high yields by a catalytic process in which a vaporous mixture of 1-propanol and oxygen are contacted in rapid sequence with (1) a dehydration catalyst and (2) an oxidation catalyst.Type: GrantFiled: September 28, 1977Date of Patent: January 30, 1979Assignee: E. I. Du Pont de Nemours and CompanyInventors: Alvin B. Stiles, David C. England
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Patent number: 4131740Abstract: Alkyl perfluoro-.omega.-fluoroformyl esters are provided which have the formula: ##STR1## wherein R is alkyl of 1-6 carbon atoms, and n is 0-6 (preferably 0). Compounds where n is 0 are prepared by contacting SO.sub.3 with a compound of the formula ROOC--CF.sub.2 --CF.sub.2 --OR.sup.1. Compounds where n is 1-6 are prepared by contacting a compound where n is 0 with hexafluoropropylene oxide.Type: GrantFiled: April 20, 1977Date of Patent: December 26, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventor: David C. England
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Patent number: 4001319Abstract: Compounds containing carboxylic acid fluoride or chloride groups react with sulfur trioxide at temperatures between -30.degree. to about 100.degree. C to give carbonyl fluoro- or chlorosulfates. Preferred reactants are polyfluoroalkyl or polyfluoroalkenyl carbacyl acid fluorides. The carbacyl halosulfates are useful as cationic polymerization catalysts and as chemical intermediates.FIELD OF THE INVENTIONThis invention relates to a method of making carbacyl halosulfates.THE PRIOR ARTCertain perhalocarbacyl fluorosulfates, ##EQU1## are known, as shown in the following tabulation.______________________________________ Reference R.sub.f ______________________________________ 1. Des Marteau and Cady, Inorg. Trifluoromethyl Chem. 5, 169 (1966); Chem. Chlorodifluoromethyl Abs. 64, 8020 (1966) Pentafluoroethyl Heptafluoropropyl 2-(Fluorosulfonyloxy)- tetrafluoroethyl 2. Delfino and Shreeve, Inorg. Trifluoromethyl Chem. 5, 308 (1966); Chem. Abs. 64, 12544 (1966) 3. Fox & Franz, Inorg. Chem. Fluoro 5, 946 (1966); Chem.Type: GrantFiled: May 7, 1973Date of Patent: January 4, 1977Assignee: E. I. Du Pont de Nemours and CompanyInventors: David C. England, Carl G. Krespan
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Patent number: 3944347Abstract: Disclosed is a segmented contact lens for the human eye constructed from fluorine-containing polymers, said lens having an index of refraction approximating that of tears and being characterized by a hard center segment surrounded by a soft tough periphery, the hard center having a Knoop hardness of at least 2 and the soft, tough periphery having a Clash-Berg torsion modulus of 95-1,000 lb/sq. in.Type: GrantFiled: February 26, 1974Date of Patent: March 16, 1976Assignee: E. I. Du Pont de Nemours & Co.Inventors: Archie E. Barkdoll, David C. England