Patents by Inventor Mitsutoshi Anzai
Mitsutoshi Anzai 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: 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: 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: 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: 5368971Abstract: A zinc benzoate compound represented by the following general formula: ##STR1## wherein R.sub.1 represents an alkyl or aralkyl group; and R.sub.2 and R.sub.3, independently from each other, each represent an alkyl, aralkyl, aryl, alkoxy or acyl group, an amino group which may be substituted, a nitro group or a halogen atom. The compound of the general formula (1) is colorless, highly stable and has excellent dispersibility in a binder resin for an electrophotographic toner, and can impart excellent frictional electrification properties to a toner, therefore being useful particularly as a charge control agent for an electrophotographic toner.Type: GrantFiled: August 11, 1993Date of Patent: November 29, 1994Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Noboru Akuzawa, Yuuji Matsuura, Genpei Sugiyama
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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: 5312707Abstract: An electrophotographic photoconductor is composed of an electroconductive substrate and a photoconductive layer formed thereon including a diamine compound of formula (I): ##STR1## wherein R.sup.1 represents an alkyl group having 1 to 4 carbon atoms, or an aryl group; R.sup.2 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, or an alkoxyl group having 1 to 4 carbon atoms; n is an integer of 1 to 3; and ##STR2## represents an arylene group or a bivalent group of a heterocyclic compound. A diamine compound for use in the electrophotographic photoconductor is also disclosed.Type: GrantFiled: September 30, 1992Date of Patent: May 17, 1994Assignees: Ricoh Company, Ltd., Hodogaya Chemical Co., Ltd.Inventors: Masafumi Ota, Masaomi Sasaki, Tamotsu Aruga, Tomoyuki Shimada, Mitsutoshi Anzai, Masaki Okubo
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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
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Patent number: 5164283Abstract: An electrophotographic developing powder comprising a resin, a coloring agent and a compound of the following formula, as a charge-controlling agent: ##STR1## wherein X is sodium or potassium, and M is a chromium or cobalt atom.Type: GrantFiled: October 25, 1991Date of Patent: November 17, 1992Assignee: Hodogaya Chemical Co., Ltd.Inventors: Isao Niimura, Mitsutoshi Anzai, Hiroyoshi Yamaga, Noboru Akuzawa
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Patent number: 4612558Abstract: A fluoran compound having the formula: ##STR1## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom, a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cyclohexyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, Q is ##STR2## (wherein X is a hydrogen atom, a halogen atom, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms), ##STR3## (wherein X is as defined above), or --(CH.sub.2).sub.n OR.sub.4 (wherein R.sub.4 is a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cycloalkyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, and n is an integer of from 1 to 8), and R.sub.3 is a hydrogen atom, a halogen atom, a lower fluoroalkyl group, an acyl group, an alkoxy group, an alkoxyalkyl group, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms.Type: GrantFiled: March 12, 1985Date of Patent: September 16, 1986Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Masahiko Yamaguchi, Kazuyuki Wakasugi, Susumu Suzuka, Michihiro Gonda, Toshiyuki Abe, Katsumasa Kikkawa, Mikiko Kanasugi
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Patent number: 4594601Abstract: A fluoran compound represented by general formula: ##STR1## where each of R.sub.1 and R.sub.2 is a C.sub.1 -C.sub.4 alkyl group, a cycloalkyl group or an aryl group, or R.sub.1 and R.sub.2 may form together with N a saturated ring, R.sub.3 is a benzyl or phenyl group which may be substituted, and R.sub.4 is a C.sub.1 -C.sub.4 alkyl group.Type: GrantFiled: September 23, 1983Date of Patent: June 10, 1986Assignee: Hodogaya Chemical Co., Ltd.Inventors: Mitsutoshi Anzai, Masahiko Yamaguchi, Michihiro Gonda, Mikiko Kanasugi, Toshio Obara