Patents by Inventor Shigeto Suzuki

Shigeto Suzuki 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).

  • Process for the preparation of 2,6-dialkylaniline from 1-nitroalkene
    Patent number: 4506098
    Abstract: A process for the preparation of 2,6-dialkylaniline which comprises the reaction of a 1-nitroalkene with a 1,3-alkadiene to form a dialkyl nitrocyclohexene adduct and subsequent reaction of the resulting adduct with hydrogen in the presence of a hydrogenation catalyst to form the corresponding dialkylcyclohexyl amine, followed by dehydrogenation with aqueous ammonia in the presence of a dehydrogenation catalyst.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: March 19, 1985
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Dithiene electroactive polymers
    Patent number: 4502980
    Abstract: Tractable doped electroactive polymers, comprising recurring units of a 1,4-dithiene ring system, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.
    Type: Grant
    Filed: November 17, 1982
    Date of Patent: March 5, 1985
    Assignee: Chevron Research Company
    Inventors: Peter Denisevich, Jr., Shigeto Suzuki, Victor P. Kurkov, Albert H. Schroeder
  • Process for the preparation of 1-nitroalkene
    Patent number: 4384149
    Abstract: A process for the preparation of 1-nitroalkene which comprises the reaction of a 1-alkene with dinitrogen tetroxide in the presence of oxygen and an ether solvent to form an alkene-dinitrogen tetroxide adduct and subsequent reaction of the resulting adduct with sodium fluoride in the presence of an inert gas.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: May 17, 1983
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Process for the preparation of 2,6-dialkylaniline from brominated dialkyl t-butylbenzene
    Patent number: 4340757
    Abstract: A process for the preparation of 2,6-dialkylaniline which comprises the reaction of 1,3-dialkyl-5-tertiary-butylbenzene with molecular bromine to form 2-bromo-1,3-dialkyl-5-tertiary-butylbenzene, which is subsequently reacted with 1,3-dialkylbenzene in the presence of hydrogen fluoride to form a mixture of 2-bromo-1,3-dialkylbenzene and 1,3-dialkyl-5-tertiary-butylbenzene, which is then reacted with ammonia in the presence of a catalytic amount of cuprous halide.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: July 20, 1982
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Preparation of alkyl alkoxyacetates
    Patent number: 4308397
    Abstract: Alkyl alkoxyacetates from C.sub.3 -C.sub.6 secondary alcohols, formaldehyde and carbon monoxide at a temperature of 5.degree. C. to -20.degree. C. and a carbon monoxide pressure of 0.5 to 275 atm.
    Type: Grant
    Filed: April 11, 1980
    Date of Patent: December 29, 1981
    Assignee: Chevron Research
    Inventor: Shigeto Suzuki
  • Process for the production of alkene-1,5-diols
    Patent number: 4254289
    Abstract: In the reaction of 3-methyl-3-buten-1-ol with aqueous formaldehyde forming isomeric alkene-1,5-diols, particularly 3-methylene-1,5-pentanediol and 3-methyl-2-pentene-1,5-diol, it has been found that yields of the diols surprisingly are substantially increased if the reaction is effected in the presence of added isobutene and the mol ratio of 3-methyl-3-buten-1-ol to formaldehyde is at least 1:1.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: March 3, 1981
    Assignee: Chevron Research Company
    Inventors: Robert G. Wall, Shigeto Suzuki, John B. Wilkes
  • Preparation of 6-amino-3-oxahexanoic acid compounds
    Patent number: 4236028
    Abstract: 3-Oxacaprolactam is prepared by a process which comprises: contacting an organic acid anhydride solution of a cyanoalkoxyalkanoate with hydrogen in the presence of a noble metal hydrogenation catalyst to prepare an amide-ester; and heating the amide-ester in excess water at a temperature above about 200.degree. C.
    Type: Grant
    Filed: March 26, 1979
    Date of Patent: November 25, 1980
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Process for preparing acetic acid derivatives
    Patent number: 4228305
    Abstract: A process for preparing glycolic acid which comprises contacting formaldehyde with formic acid in the presence of hydrogen fluoride present in an amount to serve as both catalyst and solvent for the reactants and reaction mixture.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: October 14, 1980
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Preparation of diesters
    Patent number: 4221918
    Abstract: Carboxylic acid anhydrides are contacted with hydrogen in the presence of an insoluble metal hydrogenation catalyst and strong protonic acid to produce 1,1-diesters.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: September 9, 1980
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Monochloroacetic acid from hydroxyacetic acid
    Patent number: 4221921
    Abstract: A process for producing monochloroacetic acid from hydroxyacetic acid which comprises feeding hydroxyacetic acid and aqueous hydrogen chloride to a reaction zone and contacting the hydroxyacetic acid with the aqueous hydrogen chloride in the presence of hydrogen iodide catalyst at a temperature between 100.degree. and 250.degree. C. and a pressure sufficient to maintain the aqueous hydrogen chloride in liquid phase. Preferably the reaction is carried out at a temperature between about 130.degree. and 200.degree. C.
    Type: Grant
    Filed: May 10, 1978
    Date of Patent: September 9, 1980
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Hydrogen fluoride removal from glycolic acid
    Patent number: 4188494
    Abstract: The concentration of hydrogen fluoride in crude glycolic acid made by the hydrogen fluoride-catalyzed reaction of formaldehyde and carbon monoxide can be reduced to less than about 1% by weight by removing the HF from the crude gylcolic acid by distillation or stripping with inert gas at a temperature above about 130.degree. C., thereby producing a polyglycolide subsequently convertible to glycolic acid by hydrolysis.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: February 12, 1980
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Process for preparing thioethers of mercapto-acids
    Patent number: 4172211
    Abstract: A process for preparing thioethers of mercaptocarboxylic acids by contacting glycolic acid or bromoacetic acid and a mercaptan in the presence of aqueous hydrogen bromide.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: October 23, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Alcohol production
    Patent number: 4169961
    Abstract: An alkenediol is produced from an alkenol by contacting the alkenol with formaldehyde at a pH maintained between about 4 and 7. Preferably this pH range is maintained by adding a buffering agent composed of a weak acid and the salt of a weak acid. Particularly advantageous buffering agents are the lower organic polycarboxylic acids with disodium or dipotassium hydrogen phosphate and sodium or potassium dihydrogen phosphate with disodium or dipotassium hydrogen phosphate.
    Type: Grant
    Filed: July 11, 1977
    Date of Patent: October 2, 1979
    Assignee: Chevron Research Company
    Inventors: Robert G. Wall, John B. Wilkes, Shigeto Suzuki
  • Process for preparing 1,4-dioxan-2-ones
    Patent number: 4166821
    Abstract: 1,4-Dioxan-2-ones are prepared by contacting carbon monoxide with formaldehyde, a 1,2-glycol, and a catalytic amount of hydrogen fluoride. The products of this reaction are readily converted into diglycolic acids by heating with aqueous caustic in the presence of a nickel catalyst.
    Type: Grant
    Filed: June 29, 1978
    Date of Patent: September 4, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Process for preparing thiodiglycolic acid
    Patent number: 4161612
    Abstract: A process for preparing thiodiglycolic acid comprises contacting bromoacetic acid, diglycolic acid or glycolic acid and hydrogen sulfide in the presence of aqueous hydrogen bromide.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: July 17, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Catalytic reaction of alkenyl succinic anhydrides and olefins
    Patent number: 4156686
    Abstract: A process for preparing alkyl maleic anhydrides which comprises heating a lower alkenyl succinic anhydride in the presence of a catalytic amount of ruthenium or a catalytic salt thereof under conditions effective to isomerize the alkenyl succinic anhydride.
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: May 29, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Extractive separation of glycolic acid from diglycolic acid
    Patent number: 4153809
    Abstract: Diglycolic acid is separated from glycolic acid by preferential extraction from an aqueous mixture of the two acids using an organic solution of a water-insoluble trihydrocarbylphosphine oxide as the extraction agent.
    Type: Grant
    Filed: August 11, 1977
    Date of Patent: May 8, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Process for preparing diglycolic acids
    Patent number: 4142057
    Abstract: 1,4-Dioxan-2-ones are prepared by contacting carbon monoxide with formaldehyde, a 1,2-glycol, and a catalytic amount of hydrogen fluoride. The products of this reaction are readily converted into diglycolic acids by heating with aqueous caustic in the presence of a nickel catalyst.
    Type: Grant
    Filed: August 4, 1977
    Date of Patent: February 27, 1979
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki
  • Mono-ol from diol and improved citric acid process
    Patent number: 4139556
    Abstract: A process for producing 3-methyl-3-buten-1-ol from 3-methyl-2-pentene-1,5-diol which comprises heating 3-methyl-2-pentene-1,5-diol at a temperature between 200.degree. and 450.degree. C. in the presence of isobutene.According to a preferred embodiment, the heating step and a distillation step to separate 3-methyl-2-pentene-1,5-diol from 3-methylene-1,5-pentanediol is incorporated into a citric acid synthesis method to increase the yield of citric acid from isobutene plus formaldehyde.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: February 13, 1979
    Assignee: Chevron Research Company
    Inventors: Robert G. Wall, Shigeto Suzuki
  • Preparation of chloroacetyl chloride
    Patent number: 4129595
    Abstract: Chloroacetyl chloride is prepared by reacting glycolic acid with thionyl chloride in the presence of nitrogen-containing organic compound or phosphine compound.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: December 12, 1978
    Assignee: Chevron Research Company
    Inventor: Shigeto Suzuki