Patents by Inventor Roy Dennis Bowden

Roy Dennis Bowden 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).

  • Polyfluorinated aromatic or heterocyclic derivatives with sulphurpentalfluoride group(s)
    Patent number: 6806388
    Abstract: The invention provides polyfluorinated aromatic or heterocyclic compounds comprising at least three ring substituents, at least one of which comprises a sulfurpentafluoride group and at least one of which comprises a labile group; methods for their preparation are also disclosed. Preferably, the compounds comprise either two sulfurpentafluoride groups or one sulfurpentafluoride group and one other polyfluorinated group, such as a trifluoromethyl group. Said labile group preferably comprises an amino, bromo or nitro group. Said compounds are useful in the preparation of medicaments.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: October 19, 2004
    Assignee: F2 Chemicals Limited
    Inventors: Roy Dennis Bowden, Martin Paul Greenhall
  • Polyfluorinated aromatic or heterocyclic derivatives with sulphurpentalfuoride group(s)
    Publication number: 20030096999
    Abstract: The invention provides polyflurinated aromatic or heterocyclic compounds comprising at least three ring sustitutents, at least one of which comprises a sulphurpentafluoride group and at least one of which comprises a labile group; methods for their preparation are also disclosed. Preferably, the compounds comprise either two sulphurpentafluoride groups or one sulphurpentafluoride group and one other polyflurinated group, such as a trifluoromethyl group. Said labile group preferably comprises an amino, bromo or nitro group. Said compounds are useful in the preparation of medicaments.
    Type: Application
    Filed: November 15, 2002
    Publication date: May 22, 2003
    Inventors: Roy Dennis Bowden, Martin Paul Greenhall
  • Fluorination method
    Publication number: 20030036668
    Abstract: Novel techniques are disclosed for the direct fluoridation of organic compounds by treatment with fluorine gas in a reaction mixture comprising hydrofluoric acid and at least one of water and formic acid. The techniques are particularly applicable to aromatic organic compounds and beta-dicarbonyl compounds. Increased efficiency of reaction is observed, together with improvements in yield and purity of product, with especially beneficial effects being apparent at low temperatures.
    Type: Application
    Filed: June 3, 2002
    Publication date: February 20, 2003
    Inventors: Roy Dennis Bowden, John Steward Moilliet
  • Chlorination process for producing 2,3,5-trichloropyridine
    Patent number: 4108856
    Abstract: 2,3,5-Trichloropyridine is prepared by the vapor phase chlorination of 3,5-dichloropyridine.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: August 22, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: Roy Dennis Bowden, Thomas Seaton
  • Pyridyl-tetrahydropyrans and process for preparing same
    Patent number: 4048180
    Abstract: The present invention deals with intermediate compounds, namely 4-(2'-, 3'- and 4'-pyridyl)-tetrahydropyrans and a process for their preparation. These compounds are prepared by reacting a 2'-haloethyl-3-(pyridyl)propyl ether with an alkali metal amide at -80.degree. C. to 40.degree. C.
    Type: Grant
    Filed: August 24, 1971
    Date of Patent: September 13, 1977
    Assignee: Imperial Chemical Industries Limited
    Inventor: Roy Dennis Bowden