Patents Assigned to Copyer Kabushiki Kaisha
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Patent number: 4554231Abstract: An improved electrophotographic photosensitive member is composed of a layer containing a hydrazone compound represented by the formula ##STR1## wherein R.sub.2 and R.sub.3 are each unsubstituted alkyl or substituted alkyl, unsubstituted aralkyl or substituted aralkyl, or unsubstituted aryl or substituted aryl, with the proviso that R.sub.2 and R.sub.3 are not simultaneously alkyls, n is 1 or 2, when n is 1, A represents ##STR2## wherein R.sub.1 is C.sub.1 -C.sub.5 alkyl, unsubstituted aralkyl, or substituted aralkyl, and when n is 2, A represents a direct single bond between two ##STR3## radicals.Type: GrantFiled: December 9, 1983Date of Patent: November 19, 1985Assignees: Canon Kabushiki Kaisha, Copyer Kabushiki KaishaInventors: Shozo Ishikawa, Kiyoshi Sakai, Minoru Mabuchi, Katsunori Watanabe, Makoto Kitahara
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Patent number: 4551404Abstract: An electrophotographic photosensitive member characterized by containing at least one azo pigment represented by the following formula (1), (2), or (3): ##STR1## In these formulae; ##STR2## wherein Z represents ##STR3## in which R.sub.71 is hydrogen, or substituted or unsubstituted alkyl; n is 0 or 1; R.sub.21, R.sub.22, R.sub.61 and R.sub.62 represent hydrogen, alkyl, alkoxy, nitro, or hydroxyl R.sub.31 and R.sub.32 represent hydrogen or alkoxy; and R.sub.41, R.sub.42, R.sub.43, R.sub.44, R.sub.51, R.sub.52, R.sub.53 and R.sub.54 represent hydrogen, halogen, or organic monovalent residue. ##STR4## wherein X represents a residue necessary for completing an aromatic hydrocarbon ring or a heterocyclic ring, each ring being substituted or unsubstituted; R.sub.11 represents hydrogen or alkyl; R.sub.12 represents methyl, ethyl or C.sub.3 -C.sub.8 linear alkyl; and R.sub.17 and R.sub.18 represent alkyl, aralkyl or aryl, each substituted or unsubstituted. In formula (2), R.sub.11, R.sub.Type: GrantFiled: August 9, 1982Date of Patent: November 5, 1985Assignees: Canon Kabushiki Kaisha, Copyer Kabushiki KaishaInventors: Masaaki Hiro, Yoshio Takasu, Shozo Ishikawa, Kazuharu Katagiri, Hideyuki Takahashi
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Patent number: 4500619Abstract: An electrophotographic photosensitive member comprises a layer containing at least one disazo pigment represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent hydrogen, halogen, lower alkyl or lower alkoxy; R.sub.3 represents methyl, ehtyl or C.sub.3 -C.sub.10 linear alkyl; and X represents a residue necessary to complete an aromatic hydrocarbon ring or heterocyclic ring, substituted or unsubstituted.Type: GrantFiled: March 22, 1984Date of Patent: February 19, 1985Assignees: Copyer Kabushiki Kaisha, Canon Kabushiki KaishaInventors: Shozo Ishikawa, Kazuharu Katagiri, Katsunori Watanabe, Kiyoshi Sakai, Makoto Kitahara
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Patent number: 4471040Abstract: An electrophotographic photosensitive member have a photosensitive layer, said photosensitive layer comprising at least one dis-azo pigment of Formula (I) or Formula (II) shown below: ##STR1## wherein Z represents an oxygen atom, a sulfur atom or >N--A.sub.2, wherein A.sub.2 is a hydrogen atom or a lower alkyl, A.sub.1 a hydrogen atom, a lower alkyl or a halogen atom; Ph.sub.1 an unsubstituted or substituted phenylene group, n an integer of 0 or 1, and B.sub.1 a coupler residue; with proviso that when n is 0, Z is an oxygen atom and A.sub.1 is a hydrogen atom, the case where Ph.sub.1 represents substituted phenyl radicals except for unsubstituted or mono-substituted phenyl radicals with a halogen atom, a lower alkyl or an alkoxy group;and ##STR2## wherein Ph.sub.2 represents an unsubstituted or substituted phenylene group and B.sub.2 a coupler residue.Type: GrantFiled: September 9, 1981Date of Patent: September 11, 1984Assignees: Canon Kabushiki Kaisha, Copyer Kabushiki KaishaInventors: Kazuharu Katagiri, Katsunori Watanabe, Shozo Ishikawa, Makoto Kitahara
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Patent number: 4454211Abstract: An electrophotographic photosensitive member is characterized by comprising a layer which contains at least one pyrazoline compound represented by the following formula (I) or (II): ##STR1## wherein m and n represent 0 or 1; when both m and n are 0, X.sub.1 represents a substituted or unsubstituted heterocyclic residue; R.sub.1 represents a substituted or unsubstituted aryl or heterocyclic residue; R.sub.2 and R.sub.3 each represent hydrogen or a substituted or unsubstituted aryl or heterocyclic residue; or they form spiropyrazoline cojointly with the carbon atom to which they are linked; and R.sub.5 represents hydrogen, a halogen, or a substituted or unsubstituted alkyl or aryl;when m is 1 and n is 0, X.sub.1 represents a substituted or unsubstituted heterocyclic residue; R.sub.1 and R.sub.2 each represent a substituted or unsubstituted aryl or heterocyclic residue; R.sub.3 represents hydrogen; and R.sub.4 and R.sub.Type: GrantFiled: June 1, 1982Date of Patent: June 12, 1984Assignees: Canon Kabushiki Kaisha, Copyer Kabushiki KaishaInventors: Yoshio Takasu, Shozo Ishikawa
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Patent number: 4446217Abstract: An electrophotographic photosensitive member comprises a layer containing a hydrazone compound represented by the following formula (1) or (2): ##STR1## wherein, Z is an atomic group necessary to complete a substituted or unsubstituted heterocyclic ring; R.sub.11, R.sub.12, R.sub.21, R.sub.22 and R.sub.23 represent substituted or unsubstituted alkyl, substituted or unsubstituted aralkyl, or substituted or unsubstituted aryl, and the combinations of R.sub.11 with R.sub.12 and of R.sub.22 with R.sub.23 can form each a pyrrolidine ring, piperidine ring, or morpholine ring; n is 1 or 2; and A is a monovalent heterocyclic compound residue.Type: GrantFiled: January 27, 1982Date of Patent: May 1, 1984Assignees: Canon Kabushiki Kaisha, Copyer Kabushiki KaishaInventors: Yoshio Takasu, Shozo Ishikawa