Patents by Inventor John F. Stephen

John F. Stephen 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).

  • Preparation of 2-halo-5-methylpyridines from 4-methyl-4-pentene derivatives
    Patent number: 4709063
    Abstract: A method of preparing certain 2-halo-5-methylpyridines, useful as herbicide intermediates, is presented starting from acyclic pentenes. The pentene is difunctionalized, e.g., by making the epoxide, and is then reacted with a nitrogen source to close the ring. The nitrogen-containing 6-membered heterocycle may then be aromatized readily to produce the 2-halo-5-methylpyridine desired. Also part of the invention are novel acyclic and cyclic intermediates used in the process.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: November 24, 1987
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Malonate-based light stabilizers for plastics
    Patent number: 4701485
    Abstract: Malonate-derived acetal esters and amides possessing the polyalkyl piperidin-4-yl moiety are useful light stabilizers with synthetic polymer resins such as polyolefins and, in particular, polypropylene.
    Type: Grant
    Filed: August 6, 1986
    Date of Patent: October 20, 1987
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Tartrate-based light stabilizers for plastics
    Patent number: 4690963
    Abstract: Monomeric and oligomeric derivatives of the diethyl ester of polyalkyl 1,4-dioxa-8-azaspiro-[4.5]-decane-2,3-dicarboxylic acid are useful light stabilizers for synthetic polymer resins such as polyolefins, and in particular, polypropylene.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: September 1, 1987
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Oligomeric malonate-based light stabilizers for plastics
    Patent number: 4689360
    Abstract: Oligomeric derivatives of the dialkyl esters of polyalkyl 1,5-dioxa-9-azaspiro-[5.5]undecane-3,3-dicarboxylic acid are useful light stabilizers for synthetic polymer resins such as polyolefins, and in particular, polypropylene.
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: August 25, 1987
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Tartrate-based light stabilizers for plastics
    Patent number: 4687800
    Abstract: Tartrate-derived acetal esters and amides possessing the polyalkyl piperidin-4-yl moiety are useful light stabilizers with synthetic polymer resins such as polyolefins and, in particular, polypropylene.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: August 18, 1987
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Bispiperidone precursor of 2-substituted-5-methyl-pyridines
    Patent number: 4687854
    Abstract: A process for the synthesis of compounds which are known intermediates for the pyridyloxyphenoxy herbicides as well as intermediates used in the process. Propionaldehyde and an acrylic compound, two radily available starting materials, are reacted to form a 2-formylpentanoic compound which is cyclized to a dihydro pyridone which is then oxidized to the 2-hydroxy pyridine. The hydroxypyridine may be halogenated to a 2-halopyridine.
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: August 18, 1987
    Assignee: ICI Americas Inc.
    Inventors: Ludwig A. Hartmann, John F. Stephen
  • Synthesis of 2-substituted-5-methyl-pyridines and intermediates therefor
    Patent number: 4658031
    Abstract: A process for the synthesis of compounds which are known intermediates for the pyridyloxyphenoxy herbicies as well as intermediates used in the process. Propionaldehyde and an acrylic compound, two readily available starting materials, are reacted to form a 2-formylpentanoic compound which is cyclized to a dihydro pyridone which is then oxidized to the 2-hydroxy pyridine. The hydroxypyridine may be halogenated to a 2-halopyridine.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: April 14, 1987
    Assignee: ICI Americas Inc.
    Inventors: Ludwig A. Hartmann, John F. Stephen
  • Hindered phenolic oxamide compounds and stabilized compositions
    Patent number: 4645853
    Abstract: Novel hindered phenolic compounds derived from oxamides are disclosed which are useful as stabilizers of synthetic polymer resins.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: February 24, 1987
    Assignee: ICI Americas Inc.
    Inventors: John F. Stephen, Jerry H. Smith, Makram H. Meshreki
  • Sulphur dehydrogenation process to yield 5-methyl-2-pyridone
    Patent number: 4645839
    Abstract: A method for synthesizing the aromatic compound 5-methyl-2-pyridone from the corresponding 3,4-dihydro compound by dehydrogenation using sulphur. Particular advantages are achieved by reaction at about 180.degree. C. or less. The product is useful as an intermediate for the preparation of various pyridyloxyphenoxy herbicides.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: February 24, 1987
    Assignee: ICI Americas Inc.
    Inventors: Walter M. Kruse, John F. Stephen
  • Preparation of 2-halo-5-methylpyridines from 4-methyl-4-pentene derivatives
    Patent number: 4628096
    Abstract: A method of preparing certain 2-halo-5-methylpyridines, useful as herbicide intermediates, is presented starting from acyclic pentenes. The pentene is difunctionalized, e.g., by making the epoxide, and is then reacted with a nitrogen source to close the ring. The nitrogen-containing 6-membered heterocycle may then be aromatized readily to produce the 2-halo-5-methylpyridine desired. Also part of the invention are novel acyclic and cyclic intermediates used in the process.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: December 9, 1986
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • Hindered phenolic compounds derived from hexides and stabilized compositions
    Patent number: 4613638
    Abstract: Novel phenolic compounds derived from hexides are disclosed which are useful stabilizers of synthetic polymer resins.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: September 23, 1986
    Assignee: ICI Americas Inc.
    Inventors: John F. Stephen, Jerry H. Smith, Makram H. Meshreki
  • Hindered dydroxybenzyl hexaalkyldiphenyl-methanes and stabilized compositions
    Patent number: 4600740
    Abstract: Novel hydroxybenzyl substituted hexaalkyldiphenylmethane derivatives are provided which are useful as stabilizers of resins made from at least one ethylenically unsaturated monomer.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: July 15, 1986
    Assignee: ICI Americas Inc.
    Inventors: John F. Stephen, Jerry H. Smith, Makram H. Meshreki
  • Hindered hydroxyphenylalkanoates of ethoxylated bisphenol A and stabilized compositions
    Patent number: 4598113
    Abstract: Novel hydroxyalkylarylalkanoates of ethoxylated bisphenol A are provided which are useful as stabilizers of resins made from at least one ethylenically unsaturated monomer. A process for manufacture of these stabilizers is also provided.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: July 1, 1986
    Assignee: ICI Americas Inc.
    Inventors: John F. Stephen, Jerry H. Smith, Makram H. Meshreki
  • Hindered phenolic compounds derived from hexitans and stabilized compositions
    Patent number: 4593057
    Abstract: Novel phenolic compounds derived from hexitans are disclosed which are useful stabilizers of synthetic polymer resins. A process for manufacture of these stabilizers is also provided.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: June 3, 1986
    Assignee: ICI Americas Inc.
    Inventors: John F. Stephen, Jerry H. Smith
  • Synthesis of 2-substituted-5-methyl-pyridines and intermediates therefor
    Patent number: 4584380
    Abstract: A process for the synthesis of compounds which are known intermediates for the pyridyloxyphenoxy herbicides as well as intermediates used in the process. Propionaldehyde and an acrylic compound, two readily available starting materials, are reacted to form a 2-formylpentanoic compound which is cyclized to a dihydro pyridone which is then oxidized to the 2-hydroxy pyridine. The hydroxypyridine may be halogenated to a 2-halopyridine.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: April 22, 1986
    Assignee: ICI Americas Inc.
    Inventors: Ludwig A. Hartmann, John F. Stephen
  • 2-Piperidones
    Patent number: 4504664
    Abstract: A method of preparing certain 2-halo-5-methylpyridines, useful as herbicide intermediates, is presented starting from acyclic pentenes. The pentene is difunctionalized, e.g., by making the epoxide, and is then reacted with a nitrogen source to close the ring. The nitrogen-containing 6-membered heterocycle may then be aromatized readily to produce the 2-halo-5-methyl-pyridine desired. Also part of the invention are novel acyclic and cyclic intermediates used in the process.
    Type: Grant
    Filed: May 20, 1983
    Date of Patent: March 12, 1985
    Assignee: ICI Americas Inc.
    Inventors: Richard V. Nelson, John F. Stephen
  • High yield process for preparing 4,4'-biphenol and tert-alkylated-alkylbenzenes
    Patent number: 4487978
    Abstract: Biphenol and para substituted alkyl benzene derivatives are produced in high yield and purity by heating alkyl benzene solvent solutions of tetraalkyl substituted 4,4'-biphenols in the presence of strong acid catalyst.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: December 11, 1984
    Assignee: ICI Americas Inc.
    Inventors: Walter M. Kruse, John F. Stephen
  • High yield process for preparing 3,3',5,5'-tetraalkyl-4,4'-biphenol
    Patent number: 4487977
    Abstract: 3,3',5,5'-tetraalkyl-4,4'-biphenols are prepared in high yields under relatively mild conditions by the hydrogenation of tetra-substituted diphenoquinones in alkyl benzene solvent solution.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: December 11, 1984
    Assignee: ICI Americas Inc.
    Inventors: Walter M. Kruse, John F. Stephen
  • High yield process for preparing 4,4'-biphenol and para-alkylbenzenes
    Patent number: 4482755
    Abstract: 4,4'-biphenol and tert-alkyl substituted alkyl benzene derivatives are produced by hydrogenating a tetraalkyl diphenoquinone in an alkyl benzene solvent solution under relatively mild conditions in the presence of a heterogeneous catalyst, removing said catalyst from the resultant tetraalkyl biphenol and thereafter heating said alkyl benzene solvent solution in the presence of a strong acid catalyst to form relatively pure biphenol in high yields and a para substituted alkyl benzene derivative.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: November 13, 1984
    Assignee: ICI Americas Inc.
    Inventors: Walter M. Kruse, John F. Stephen
  • Synthesis of 2-substituted-5-methyl-pyridines
    Patent number: 4473696
    Abstract: A process for the synthesis of compounds which are known intermediates for the pyridyloxyphenoxy herbicides as well as intermediates used in the process. Propionaldehyde and an acrylic compound, two readily available starting materials, are reacted to form a 2-formylpentanoic compound which is cyclized to a dihydro pyridone which is then oxidized to the 2-hydroxy pyridine. The hydroxypyridine may be halogenated to a 2-halopyridine.
    Type: Grant
    Filed: October 7, 1982
    Date of Patent: September 25, 1984
    Assignee: ICI Americas Inc.
    Inventors: Ludwig A. Hartmann, John F. Stephen