Patents by Inventor Keiji Oya
Keiji Oya 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: 8029976Abstract: Disclosed is to provide with an optical recording medium of a write-once type in which an excellent recording characteristic can be obtained over low speed recording to high speed recording.Type: GrantFiled: October 24, 2005Date of Patent: October 4, 2011Assignees: Sony Corporation, Adeka CorporationInventors: Yutaka Wada, Masatsugu Suwabe, Junko Shimada, Toru Yano, Keiji Oya, Koichi Shigeno
-
Patent number: 7316836Abstract: An optical recording medium comprises a transmission substrate and a recording layer formed on the transmission substrate, the recording layer containing at least a dye material expressed by a general formula shown at the following chemical formula (in the chemical formula 1, R1 represents alkyl group having carbon numbers 1 to 4, R2, R3 represent alkyl group having carbon numbers 1 to 4, benzyl group or groups combined to form 3 to 6 rings, Y1 and Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6) and a dye material expressed by a general formula represented by the following chemical formula 2(in the chemical formula 2, R1 and R2 represent alkyl groups having carbon numbers 1 to 4, benzyl groups or groups combined to form 3 to 6 rings, Y1, Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6): In a write once type optical recording medium such as DVD?R and DVD+R, satisfactory recording characteristics can be obtained from low-speed recording to high-Type: GrantFiled: October 27, 2004Date of Patent: January 8, 2008Assignee: Sony CorporationInventors: Yutaka Wada, Masatsugu Suwabe, Toshihiro Akimori, Junko Shimada, Keiji Oya, Koichi Shigeno, Toru Yano
-
Publication number: 20060110566Abstract: Disclosed is to provide with an optical recording medium of a write-once type in which an excellent recording characteristic can be obtained over low speed recording to high speed recording.Type: ApplicationFiled: October 24, 2005Publication date: May 25, 2006Inventors: Yutaka Wada, Masatsugu Suwabe, Junko Shimada, Toru Yano, Keiji Oya, Koichi Shigeno
-
Publication number: 20050094548Abstract: An optical recording medium comprises a transmission substrate and a recording layer formed on the transmission substrate, the recording layer containing at least a dye material expressed by a general formula shown at the following chemical formula (in the chemical formula 1, R1 represents alkyl group having carbon numbers 1 to 4, R2, R3 represent alkyl group having carbon numbers 1 to 4, benzyl group or groups combined to form 3 to 6 rings, Y1 and Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6) and a dye material expressed by a general formula represented by the following chemical formula 2(in the chemical formula 2, R1 and R2 represent alkyl groups having carbon numbers 1 to 4, benzyl groups or groups combined to form 3 to 6 rings, Y1, Y2 independently represent organic groups and X represent ClO4, BF4, PF6, SbF6): In a write once type optical recording medium such as DVD?R and DVD+R, satisfactory recording characteristics can be obtained from low-speed recording to high-sType: ApplicationFiled: October 27, 2004Publication date: May 5, 2005Applicants: Sony Corporation, ASAHI DENKA CO., LTD.Inventors: Yutaka Wada, Masatsugu Suwabe, Toshihiro Akimori, Junko Shimada, Keiji Oya, Koichi Shigeno, Toru Yano
-
Publication number: 20030224293Abstract: An optical recording medium comprising a substrate having formed thereon a thin film comprising an organic compound dye that can form pits when irradiated with a semiconductor laser beam and a compound represented by formula (I) as a recording layer: 1Type: ApplicationFiled: February 19, 2003Publication date: December 4, 2003Applicant: ASAHI DENKA KOGYO KABUSHIKI KAISHAInventors: Keiji Oya, Atsurou Tomita, Toru Yano
-
Patent number: 5728646Abstract: A heat-sensitive recording material, comprising a heat-sensitive recording layer containing at least one acid hydrazide compound represented by the following general formula (I): ##STR1## wherein X.sub.1 and X.sub.2 each independently represent a hydrogen atom, a hydroxyl group, a halogen atom or an alkyl group or alkoxy group having 1 to 10 carbon atoms, A represents --CO-- or --SO.sub.2 --, n is 1 or 2, when n is 1, R.sub.1 represents an alkyl group, an aryl group, a hydroxyaryl group, an alkoxyaryl group, or an alkylaryl group having 1 to 22 carbon atoms and when n is 2, R.sub.1 represents an alkylene group or arylene group having 1 to 18 carbon atoms or a direct bond.Type: GrantFiled: November 5, 1996Date of Patent: March 17, 1998Assignee: Asahi Denka Kogyo Kabushiki KaishaInventors: Nobuhide Tominaga, Keiji Oya
-
Patent number: 5607894Abstract: The heat-sensitive recording material of the present invention comprises a heat-sensitive recording layer containing at least one resorcylic anilide derivative represented by the following general formula: ##STR1## wherein R.sub.1 represents an alkyl or alkoxy, group having 1 to 4 carbon atoms and R.sub.2 represents a hydrogen atom or an alkyl or alkoxy group having 1 to 4 carbon atoms.Type: GrantFiled: June 7, 1995Date of Patent: March 4, 1997Assignee: Asahi Denka Kogyo Kabushiki KaishaInventors: Mitsuo Akutsu, Nobuhide Tominaga, Keiji Oya, Athuo Tomita, Kouichi Shigeno
-
Patent number: 5081099Abstract: A heat-sensitive recording material wherein a color-forming layer comprising a coupling substance which is usually colorless or light-colored and a developer which gives rise to color in the coupling substance upon heating further contains, as a sensitizer, a tetrahydronaphthalene compound of the following general formula (I): ##STR1## wherein X represents an alkylene group, --O--CO--O--, --O--CO-- or --O--R'.sub.n Y--, n represents 1 or 2, Y represents --O-- or --S--, R' represents an alkylene group, and R represents a phenyl, alkylphenyl or tetrahydronaphthyl group.Type: GrantFiled: July 19, 1990Date of Patent: January 14, 1992Assignee: Adeka Argus Chemical Co., Ltd.Inventors: Mitsuo Akutsu, Syuji Iwakura, Keiji Oya
-
Patent number: 4980336Abstract: A heat-sensitive recording material wherein 1,2-bis(3,4-dimethylphenyl)ethane is contained as a sensitizer in a color-forming layer comprising a usually colorless or light-colored coupling substance and a developer which causes coloring of the coupling substance upon heating.Type: GrantFiled: October 27, 1989Date of Patent: December 25, 1990Assignee: Adeka Argus Chemical Co., Ltd.Inventors: Mitsuo Akutsu, Syuji Iwakura, Keiji Tabata, Keiji Oya
-
Patent number: 4944980Abstract: An optical recording material having excellent light stability, shelf stability and solubility in a solvent comprises, as an indispensable constituent, a compound of the following general formula: ##STR1## wherein R represents a cycloalkyl group having 3 to 12 carbon atoms, X.sup.- represents a halide anion, a perchlorate anion or a quencher anion, rings A and B each represent a benzene or naphthalene ring which may be substituted with a halogen atom, and n represents 1 to 4.Type: GrantFiled: July 25, 1989Date of Patent: July 31, 1990Assignee: Adeka Argus Chemical Co., Ltd.Inventors: Mitsuo Akutsu, Syuji Iwakura, Keiji Oya
-
Patent number: 4918046Abstract: A heat-sensitive recording material which comprises a usually colorless or light-colored coloring material together with one or more compounds selected from among bissulfonate compounds, 2-substituted cyclohexyl sulfonate derivatives and biscycloalkyl aryldisulfonate derivatives.Type: GrantFiled: December 16, 1988Date of Patent: April 17, 1990Assignee: Adeka Argus Chemical Co., Ltd.Inventors: Mitsuo Akutsu, Syuji Iwakura, Keiji Oya, Keiji Tabata