Patents by Inventor Carl George Krespan

Carl George Krespan 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: 6525231
    Abstract: A process is disclosed for producing RCFZH by reaction of an iodide compound of the formula R′CFZI with hydrogen at an elevated temperature, wherein R is SF5, CF2SF5 or RfCF2Y, R′ is SF5, CF2SF5 or RfCF2X, Rf is a perfluoroalkylene group containing from 1 to about 12 carbon atoms and optionally containing one or more ether oxygen atoms, Z is selected from F, CF3 and CF2CF3, Y is selected from H, F and SF5, and X is selected from H, F, SF5, and I, provided that when Y is F, X is F, when Y is SF5, X is SF5, and when Y is H, X is H or I.
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: February 25, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Douglas Robert Anton, Carl George Krespan, Allen Capron Sievert
  • Patent number: 6506950
    Abstract: The compounds CF3CHFCHFCF2CF3, CF3CH2CHFCF2CF3, CF3CHFCH2CF2CF3, CF3CHFCHFCF2CF2CF3, CF3CH2CHFCF2CF2CF3, CF3CHFCH2CF2CF2CF3, CF3CF2CH2CHFCF2CF3, CF3CF2CHFCHFCF2CF2CF3, CF3CHFCHFCF2CF2CF2CF3, CF3CHFCH2CF2CF2CF2CF3, CF3CH2CHFCF2CF2CF2CF3, CF3CF2CHFCH2CF2CF2CF3, and CF3CF2CH2CHFCF2CF2CF3; and compositions thereof. Catalytic processes using Group VIII metals are disclosed for reacting selected olefinic starting materials with hydrogen to produce as the major products dihydropolyfluoroalkanes or trihydropolyfluoroalkanes wherein the hydrogens are positioned on two adjacent carbon atoms; as are processes using iodine and/or hydrogen iodide in the reduction of selected olefinic starting materials to dihydropolyfluoroalkanes or trihydropolyfluoroalkanes.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: January 14, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Carl George Krespan
  • Patent number: 6262320
    Abstract: A process for the Lewis acid catalyzed addition of trifluoromethanes across the carbon-carbon double bond of fluoroolefins is disclosed. A process for isomerization of monohaloperfluoro alkanes is also disclosed.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: July 17, 2001
    Assignee: E. I. duPont de Nemours and Company
    Inventors: Carl George Krespan, Viacheslav Alexandrovich Petrov
  • Patent number: 6025521
    Abstract: This invention relates to carbon based initiators for polymerization and telomerization reactions. Polymers produced are useful as water repellants and materials with high temperature resistance. Telomers are useful as intermediates in the production of chemically inert and temperature resistant materials.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: February 15, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, Viacheslav Alexandrovich Petrov
  • Patent number: 5962746
    Abstract: A process for the faster manufacturing of hydrocarbon, fluorocarbon and chlorocarbon acyl peroxides is disclosed wherein a hydroxide, a peroxide and an acyl halide are reacted under continuous vigorous agitation conditions so as to bring the reaction to substantial completion is less than one minute.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: October 5, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: George Francis Diffendall, Thomas William Harding, Joseph Norman Hockman, Carl George Krespan, Matthew John Targett, Robert Clayton Wheland
  • Patent number: 5929293
    Abstract: The invention concerns processes for the preparation of fluoroolefins, including a process for the deiodofluorination of an iodine containing fluorocarbon comprising contacting said iodine containing fluorocarbon with a fluoroolefin in the presence of an aluminum chlorofluoride catalyst.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: July 27, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, Viacheslav Alexandrovich Petrov
  • Patent number: 5908966
    Abstract: Disclosed herein is a telomerization process for preparing fluorinated alkyl iodide telomers, comprising telomerizing a starting polyfluoroalkyl iodide with a terminally unsaturated perfluoro olefin or monochlorofluoro olefin.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: June 1, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, Viacheslav A. Petrov
  • Patent number: 5831131
    Abstract: A process for the faster manufacturing of hydrocarbon, fluorocarbon and chlorocarbon acyl peroxides is disclosed wherein a hydroxide, a peroxide and an acyl halide are reacted under continuous vigorous agitation conditions so as to bring the reaction to substantial completion is less than one minute.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: November 3, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, Robert Clayton Wheland
  • Patent number: 5723701
    Abstract: The compounds CF.sub.3 CHFCHFCF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.2 CHFCF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CHFCHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCHFCF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, and CF.sub.3 CF.sub.2 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.3 ; and compositions thereof.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: March 3, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Carl George Krespan
  • Patent number: 5683978
    Abstract: The compounds CF.sub.3 CHFCHFCF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CH.sub.2 CHFCF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CHFCHFCF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCHFCF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, CF.sub.3 CF.sub.2 CHFCH.sub.2 CF.sub.2 CF.sub.2 CF.sub.3, and CF.sub.3 CF.sub.2 CH.sub.2 CHFCF.sub.2 CF.sub.2 CF.sub.3 ; and compositions thereof.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: November 4, 1997
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl George Krespan, V. N. Mallikarjuna Rao
  • Patent number: 4021489
    Abstract: Described is the reaction of SO.sub.3 with 4- and 5-membered ring fluorovinyl ethers to produce .alpha.,.beta.-cycloalkenones useful, for example, as mild cationic polymerization initiators.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: May 3, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Carl George Krespan, Bruce Edmund Smart
  • Patent number: 4005104
    Abstract: Selected novel vic-dialkoxyperfluoroalkyl-vic-diol cyclic sulfates, e.g., 2,3-dimethoxyhexafluorobutane-2,3-diol cyclic sulfate, useful for preparing the corresponding perfluoro-.alpha.-diketones, e.g., hexafluorobiacetyl (known), are synthesized by reacting SO.sub.3 with a vic-dialkoxypolyfluoroalkene, e.g., 2,3-dimethoxyhexafluorobutene-2.
    Type: Grant
    Filed: August 15, 1975
    Date of Patent: January 25, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl George Krespan
  • Patent number: 3962325
    Abstract: Trifluoromethyl compounds of the formulas ##EQU1## are useful as oil repellants. Substituted barbituric acid derivatives thereof of the formula ##EQU2## are useful as central nervous system depressants for animals. Trifluoromethylfluorocarbonylketene and trifluoromethylmalonyl fluoride are prepared by reacting perfluoromethylacryloyl fluoride with a carboxylic acid.
    Type: Grant
    Filed: October 4, 1973
    Date of Patent: June 8, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl George Krespan
  • Patent number: 3952015
    Abstract: Compound having the formula ##EQU1## WHEREIN Y is --XCH.sub.2 CH.sub.2 --X--, --X(CH.sub.2 CH.sub.2 X).sub.2 or ##EQU2## p is 1 to 4, and each X is O or NH, N-alkanoyl, N-benzoyl wherein the benzene ring is optionally substituted with --NO.sub.2, --NH.sub.2, or --CH.sub.3, N-alkyl or N-.beta.-hydroxyalkyl each of up to 8 carbons and wherein the total number of N is 1 to 3 are disclosed. The compounds can be polymerized by opening of the oxetane ring in the presence of electrophilic agents, or the oxetane ring can be hydrolyzed to a dihydroxy group and reacted with diacid halides to form polyesters or with diisocyanates to form polyurethanes. Both monomers and polymers complex metal ions and can be used to separate such ions from solutions.
    Type: Grant
    Filed: August 9, 1974
    Date of Patent: April 20, 1976
    Inventor: Carl George Krespan