Patents by Inventor Yasushi Obora

Yasushi Obora 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).

  • Patent number: 11203605
    Abstract: An organosilicon compound can be efficiently produced by using metallic element-containing nanoparticles such as a platinum element-containing nanoparticle having a solvent on surface as a catalyst of the hydrosilylation reaction of alkenes.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: December 21, 2021
    Assignee: THE SCHOOL CORPORATION KANSAI UNIVERSITY
    Inventors: Yasushi Obora, Xianjin Lin, Yumiko Nakajima, Shigeru Shimada, Kazuhiko Sato
  • Publication number: 20190337967
    Abstract: An organosilicon compound can be efficiently produced by using metallic element-containing nanoparticles such as a platinum element-containing nanoparticle having a solvent on surface as a catalyst of the hydrosilylation reaction of alkenes.
    Type: Application
    Filed: July 12, 2019
    Publication date: November 7, 2019
    Applicant: THE SCHOOL CORPORATION KANSAI UNIVERSITY
    Inventors: Yasushi OBORA, Xianjin LIN, Yumiko NAKAJIMA, Shigeru SHIMADA, Kazuhiko SATO
  • Patent number: 7619003
    Abstract: A process for producing an optically active compound based on the hydrolysis of an alkenyl ester compound or the cleavage of an alkenyl ether compound. The process uses neither an acidic compound nor a basic compound, and reactants can be reacted in a high concentration. It does not necessitate a buffer, nutrient, etc. unlike enzymatic reactions or reactions using a microorganism. It is a simple process which attains a satisfactory production efficiency. The process, which is for producing an optically active carboxylic acid or optically active alcohol represented by the general formula (VI): (wherein R1, R2, and R3 are different groups; and A represents methylene, carbonyl, or a single bond), is characterized by causing water to act on an alkenyl ester or alkenyl ether represented by the general formula (I): (wherein R4, R5, and R6 each represents hydrogen, alkyl, etc.) in the presence of a specific transition metal complex having an optically active ligand.
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: November 17, 2009
    Assignee: Japan Science and Technology Agency
    Inventors: Makoto Tokunaga, Yasushi Tsuji, Yasushi Obora, Yoji Hori, Hiroshi Aoyama
  • Publication number: 20080067922
    Abstract: Disclosed is an organic EL device comprising an electroluminescent layer having a single layer or a multilayered structure of two or more layers, the electroluminescent layer containing a pyridine derivative represented by the formula (1): wherein Ar1 represents an aryl group, m represents an integer of 1 to 5, ? represents a group represented by the formula (1a): (wherein Ar2 represents an aryl group, and p represents an integer of 1 to 5), or the formula (1b): (wherein Ar3 represents an aryl group, and q represents an integer of 1 to 5), and n represents an integer of 0 to 2. The organic EL device is excellent in luminescent efficiency, luminance and durability, and emits blue light with improved luminescent efficiency and luminance, which are the same as those of other colors, and is also is excellent in durability.
    Type: Application
    Filed: September 22, 2005
    Publication date: March 20, 2008
    Inventors: Ayataka Endo, Chihaya Adachi, Yasushi Tsuji, Makoto Tokunaga, Yasushi Obora, Tetsuo Iwasawa
  • Publication number: 20060173210
    Abstract: A process for producing an optically active compound based on the hydrolysis of an alkenyl ester compound or the cleavage of an alkenyl ether compound. The process uses neither an acidic compound nor a basic compound, and rectants can be reacted in a high concentration. It does not necessitate a buffer, nutrient, etc. unlike enzymatic reactions or reactions using a microorganism. It is a simple process which attains a satisfactory production efficiency. The process, which is for producing an optically active carboxylic acid or optically active alcohol represented by the general formula (VI): (wherein R1, R2, and R3 are different groups; and A represents methylene, carbonyl, or a single bound), is characterized by causing water to act on an alkenyl ester or alkenyl ether represented by the general formula (I): (wherein R4, R5, and R6 each represents hydrogen, alkyl, etc.) in the presence of a specific transition metal complex having an optically active ligand.
    Type: Application
    Filed: January 28, 2004
    Publication date: August 3, 2006
    Applicants: Japan Science and Technology Agency, Takasago International Corporation
    Inventors: Makoto Tokunaga, Yasushi Tsuji, Yasushi Obora, Yoji Hori, Hiroshi Aoyama
  • Patent number: 6040401
    Abstract: Bridged, group 4 Metal complexes useful as olefin polymerization catalyst components corresponding to the formula: L.sub.1 ZL.sub.2 MX.sub.m X'.sub.nor a dimer, solvated adduct, chelated derivative or mixture thereof, wherein:L.sub.1 is a partially saturated tricyclic group, especially octahydrofluorenyl,L.sub.2 is a substituted cyclopentadienyl group that is bound to M by means of delocalized .pi.-electrons, said cyclopentadienyl group being substituted at one and only one of its two distal positions with a bulky ligand group,Z is divalent bridging substituent,X each occurrence is a monovalent, anionic moiety having up to 40 non-hydrogen atoms, optionally, two X groups may be covalently bound together forming a divalent dianionic moiety having both valences bound to M, or, optionally 2 X groups may be covalently bound together to form a neutral, conjugated or nonconjugated diene that is bonded to M by means of delocalized .pi.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: March 21, 2000
    Assignees: The Dow Chemical Company, Northwestern University
    Inventors: Peter N. Nickias, Tobin J. Marks, Yasushi Obora