Patents by Inventor Kayoko Watanabe
Kayoko Watanabe 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).
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Patent number: 5679489Abstract: The present invention provides an electrophotographic toner free of metal such as chromium. A novel electrostatic image developing toner is provided, comprising as a charge-controlling agent one or more selected from the group consisting of compounds represented by formulae (I) and (II): ##STR1## wherein A, B and R are as defined in the specification.Type: GrantFiled: March 22, 1996Date of Patent: October 21, 1997Assignee: Hodogaya Chemical Co., Ltd.Inventors: Osamu Mukudai, Yuuji Matsuura, Isao Niimura, Kayoko Watanabe, Keiko Iwasa
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Patent number: 5413892Abstract: An electrostatic image developing toner containing a compound of the following formula (1): ##STR1## wherein X is ##STR2## (wherein D is a hydrogen atom or an electron donating group, and each of R.sub.1 and R.sub.2 which are independent of each other, is a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, an aralkyl group, a hydroxyl group, an amino group, a dialkylamino group, a diarylamino group, a diaralkylamino group, a halogen atom, a halogen-substituted alkyl group, a halogen-substituted aryl group, a cyano group, a formyl group, a carboxyl group, a carbamoyl group, an N-substituted carbamoyl group, an alkoxycarbonyl group, an acyloxy group, an acyl group, an arylcarbonyl group, a nitro group, a sulfonic acid group, an alkylsulfonyl group, a substituted sulfonyl group, a sulfamoyl group, an N-substituted sulfamoyl group or a substituted sulfinyl group, provided that when D is a hydrogen atom, R.sub.1 and R.sub.Type: GrantFiled: May 18, 1994Date of Patent: May 9, 1995Assignee: Hodogaya Chemical Co., Ltd.Inventors: Yuji Matsuura, Osamu Mukudai, Mitsutoshi Anzai, Kayoko Watanabe
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Patent number: 5413891Abstract: An electrophotographic toner containing a compound of the following formula (1): ##STR1## wherein X is awherein A is an electron attractive group, and each of R.sub.1 and R.sub.2 which are independent of each other, is a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, an aralkyl group or a hydroxyl group, or R.sub.1 and R.sub.2 together form a ring), ##STR2## wherein A, R.sub.1 and R.sub.2 are as defined above), or ##STR3## wherein A, R.sub.1 and R.sub.2 are as defined above), and Y is a hydrogen atom, an alkyl group or an aryl group.Type: GrantFiled: April 13, 1994Date of Patent: May 9, 1995Assignee: Hodogaya Chemical Co., Ltd.Inventors: Yuji Matsuura, Osamu Mukudai, Mitsutoshi Anzai, Kayoko Watanabe
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Patent number: 5391454Abstract: An electrostatic image developing toner containing at least one compound selected from the group consisting of sulfonylurea compounds of the following formula (1): ##STR1## wherein A is a phenyl group which may have a substituent, or a naphthyl group which may have a substituent, and each of B and C which are independent of each other, is a hydrogen atom, an alkyl group, a phenyl group which may have a substituent, or a naphthyl group which may have a substituent, or B and C together form a ring; or the following formula (2):D--SO.sub.2 NHCONH--X--NHCONHSO.sub.2 --E (2)wherein each of D and E which are independent of each other, is an alkyl group, a phenyl group which may have a substituent, or a naphthyl group which may have a substituent, and X is a phenylene group which may have a substituent, a biphenylene group which may have a substituent, or a naphthylene group which may have a substituent.Type: GrantFiled: February 23, 1994Date of Patent: February 21, 1995Assignee: Hodogaya Chemical Co., Ltd.Inventors: Osamu Mukudai, Yuji Matsuura, Mitsutoshi Anzai, Kayoko Watanabe
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Patent number: 5378573Abstract: An electrophotographic toner containing a compound of the following formula (I): ##STR1## wherein each of X and Y which are independent of each other, is a hydrogen atom, ##STR2## (wherein each of D.sub.1 and D.sub.2 is a hydrogen atom or an electron donating group, provided that D.sub.1 and D.sub.2 are not simultaneously hydrogen atoms, R.sub.1 is a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, an acyl group, a nitro group, a cyano group or R.sub.2 SO.sub.2 -- (wherein R.sub.2 is a hydroxyl group, an amino group, an alkyl-substituted amino group, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group or an alkoxy group), and n is 0, 1 or 2, provided that when n is 2, the plurality of R.sub.1 may be the same or different), ##STR3## (wherein D.sub.3 is an electron donating group, and R.sub.1 and n are as defined above), ##STR4## (wherein D.sub.3, R.sub.1 and n are as defined above), ##STR5## (wherein D.sub.3, R.sub.Type: GrantFiled: January 28, 1993Date of Patent: January 3, 1995Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Yuji Matsuura, Osamu Mukudai, Miki Kanno, Kayoko Watanabe
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Patent number: 5346794Abstract: An electrophotographic toner containing a compound of the following formula (I): ##STR1## wherein each of X and Y which are independent of each other, is a hydrogen atom, ##STR2## (wherein each of A.sub.1 and A.sub.2 is a hydrogen atom or an electron attracting group, provided that A.sub.1 and A.sub.2 are not simultaneously hydrogen atoms, R.sub.1 is a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, an alkoxy group, a dialkylamino group, a diarylamino group, a diaralkylamino group or a hydroxyl group, and n is 0, 1 or 2, provided that when n is 2, the plurality of R.sub.1 may be the same or different), ##STR3## (wherein A.sub.3 is an electron attracting group, and R.sub.1 and n are as defined above), ##STR4## (wherein A.sub.3, R.sub.1 and n are as defined above), ##STR5## (wherein A.sub.3, R.sub.1 and n are as defined above) or ##STR6## (wherein A.sub.3 is as defined above, and each of R.sub.2 and R.sub.Type: GrantFiled: January 28, 1993Date of Patent: September 13, 1994Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Yuji Matsuura, Osamu Mukudai, Miki Kanno, Kayoko Watanabe
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Patent number: 5232809Abstract: Provided is a toner for electrophotography, comprising a binder resin, a colorant and a charge control agent; said charge control agent comprising an aluminum compound represented by the following formula: ##STR1## wherein R.sub.1 represents an alkyl group, a cycloalkyl group or an aralkyl group; R.sub.2 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, a hydroxyl group or an alkoxyl group; n represents an integer of 2 or 3; and M represents a hydrogen atom, an alkali metal, or an ammonium, aliphatic ammonium or alicyclic ammonium ion.Type: GrantFiled: December 20, 1991Date of Patent: August 3, 1993Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Noboru Akuzawa, Yuuji Matsuura, Kayoko Watanabe