Patents by Inventor Takeshi Yamahara

Takeshi Yamahara 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).

  • Production of tertiary olefins
    Patent number: 4398051
    Abstract: Method of producing tertiary olefins from alkyl tert-alkyl ethers using a catalyst produced by calcining an aluminum compound supported on a carrier containing silicon oxides at a temperature above that at which the aluminum compound decomposes.
    Type: Grant
    Filed: October 16, 1981
    Date of Patent: August 9, 1983
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masashi Araki, Takuo Hibi, Tomofumi Kawabe, Takeshi Yamahara
  • Production of alpha-amino acids
    Patent number: 4082767
    Abstract: .alpha.-Amino acids are prepared by catalytically hydrolyzing a hydantoin compound of the formula, ##STR1## wherein R.sub.1 and R.sub.2 are individually hydrogen or an unsubstituted or substituted alkyl, cycloalkyl, alkenyl, aryl or aralkyl group, in the presence of imidazole or a derivative thereof.
    Type: Grant
    Filed: March 30, 1976
    Date of Patent: April 4, 1978
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takeshi Yamahara, Shun Inokuma
  • Process for producing phenols
    Patent number: 4071569
    Abstract: Phenols can be produced in a high yield together with useful aldehydes by cleaving a secondary alkylbenzene hydroperoxide in the presence of sulfur, a sulfur oxide or a phosphorus sulfide and then separating the desired phenols from the cleavage product.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: January 31, 1978
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takeshi Yamahara, Tetsuo Takano, Mitsuhisa Tamura, Hiroshi Yoshihara
  • Process for preparing acid amides
    Patent number: 3980662
    Abstract: The acid amides are produced by a process comprising hydrating a nitrile compound in the presence of a copper-containing polymer having basic nitrogenous groups in the polymer chain or linked with the polymer chain as a catalyst.
    Type: Grant
    Filed: June 12, 1974
    Date of Patent: September 14, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yoshihiro Watanabe, Takeshi Yamahara, Shun Inokuma, Tooru Tokumaru