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Keiichi Yokoyama
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Iwakuni, JP
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last 30 patents
Information
Patent Grant
Fluorine-substituted cyclic carbonate and electrolytic solution and...
Patent number
6,180,800
Issue date
Jan 30, 2001
Mitsui Chemicals, Inc.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Fluorine-substituted cyclic carbonate electrolytic solution and bat...
Patent number
6,010,806
Issue date
Jan 4, 2000
Mitsui Chemicals, Inc.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Acrylic ester, novel allyl ether, novel allyl carbonate, acrylic es...
Patent number
5,977,277
Issue date
Nov 2, 1999
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Ionically conductive polymeric gel electrolyte and solid battery co...
Patent number
5,925,283
Issue date
Jul 20, 1999
Mitsui Chemicals, Inc.
Masahiro Taniuchi
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Process for removal of diol as impurity in cyclic carbonic acid ester
Patent number
5,922,888
Issue date
Jul 13, 1999
Mitsui Petrochemical Industries, Ltd.
Masahiro Toriida
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Carbonate compounds, non-aqueous electrolytic solutions and batteri...
Patent number
5,847,188
Issue date
Dec 8, 1998
Mitsui Chemicals, Inc.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Non-aqueous electrolytic solutions and batteries comprising non-aqu...
Patent number
5,659,062
Issue date
Aug 19, 1997
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Carbonate compounds, non-aqueous electrolytic solutions and batteri...
Patent number
5,633,099
Issue date
May 27, 1997
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Non-aqueous electrolytic solutions and non-aqueous electrolyte cell...
Patent number
5,580,684
Issue date
Dec 3, 1996
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Secondary battery having non-aqueous electrolyte
Patent number
5,561,005
Issue date
Oct 1, 1996
Sony Corporation
Atsuo Omaru
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Cell electrolyte solvent, cell electrolyte comprising the solvent a...
Patent number
5,385,794
Issue date
Jan 31, 1995
Mitsui Petrochemical Industries Ltd.
Keiichi Yokoyama
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Pyrimidines and pharmaceutically acceptable salts thereof useful in...
Patent number
5,304,555
Issue date
Apr 19, 1994
Mitsui Petrochemical Industries, Ltd.
Akira Awaya
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Coumaran group containing amine compounds and their acid addition s...
Patent number
5,192,799
Issue date
Mar 9, 1993
Mitsui Petrochemical Industries, Ltd.
Ikuo Tomino
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Novel alpha-chloroketone derivative and process for preparation the...
Patent number
5,041,660
Issue date
Aug 20, 1991
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Indan derivatives
Patent number
4,966,968
Issue date
Oct 30, 1990
Mitsui Petrochemical Industries, Ltd.
Isao Hashimoto
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Therapeutic agent for neurological diseases
Patent number
4,959,368
Issue date
Sep 25, 1990
Mitsui Petrochemical Industries Ltd.
Akira Awaya
A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information
Patent Grant
Method of producing polysilane compounds
Patent number
4,900,861
Issue date
Feb 13, 1990
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Cyanoguanidine derivative and process for preparation thereof
Patent number
4,886,912
Issue date
Dec 12, 1989
Mitsui Petrochemical Industries, Ltd.
Hiroaki Tan
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
2-piperazinopyrimidine derivatives
Patent number
4,742,165
Issue date
May 3, 1988
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Quinazoline compounds and antihypertensives
Patent number
4,734,418
Issue date
Mar 29, 1988
Mitsui Petrochemical Industries, Ltd.
Keiichi Yokoyama
C07 - ORGANIC CHEMISTRY