Patents by Inventor Hidetsugu Tanaka

Hidetsugu Tanaka 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).

  • Method for the production of alken-2-ol-1 or of alken-2-ol-1 and alkanol-1
    Patent number: 4122291
    Abstract: Production of an alken-2-ol-1, or of an alken-2-ol-1 and an alkanol-1 from the corresponding alken-3-ol-1 is described. The above compound or compounds can be produced with good selectivity by converting an alken-3-ol-1 to the boric acid ester, and, then, contacting the ester with a palladium catalyst in the presence of hydrogen or, alternatively, by carrying out the latter-mentioned step under conditions favorable to the formation of said boric acid ester and, thereafter, subjecting the reaction product to solvolysis.
    Type: Grant
    Filed: June 6, 1977
    Date of Patent: October 24, 1978
    Assignee: Kuraray Co., Ltd.
    Inventors: Sunao Kyo, Tsumoru Renge, Hidetsugu Tanaka
  • Process for the production of polyhydric alcohols
    Patent number: 4069261
    Abstract: Polyhydric alcohols can be produced in high selectivity from substituted 1,3-dioxanes containing at least one hydroxyalkyl group by heating, in the presence of water, said 1,3-dioxane or mixtures thereof in contact with boric acid, boric acid anhydride or a boron-containing compound capable of forming boric acid under the reaction conditions and recovering the polyhydric alcohols corresponding to said 1,3-dioxanes.
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: January 17, 1978
    Assignee: Kuraray Co., Ltd.
    Inventors: Sunao Kyo, Katsuhiko Hayashi, Hidetsugu Tanaka, Hideaki Oka
  • Separation and recovery of 3-methyl-3-butene-1-ol
    Patent number: 3947504
    Abstract: The 3-methyl-3-butene-1-ol contained in the oily mixture obtained in the production of isoprene by the reaction of isobutene and formaldehyde through the intermediate 4,4-dimethyl-1,3-dioxane can be isolated by adding boric acid to said mixture to form the boric acid ester of 3-methyl-3-butene-1-ol and recovering the higher boiling fraction having a boiling point of above 160.degree.C.
    Type: Grant
    Filed: February 27, 1974
    Date of Patent: March 30, 1976
    Assignee: Kuraray Co., Ltd.
    Inventors: Sunao Kyo, Hideaki Oka, Katsuhiko Hayashi, Hidetsugu Tanaka