Abstract: An electrophotographic photosensitive member has a charge-generating layer which includes selected photosensitive pigment particles and a compound which is a tetracyanoanthraquinodimethane compound, an anthraquinone compound, a dicyanovinyl compound, or a special quinone compound. The compound is incorporated in an amount in a range from 0.01 to 2 molar equivalents, preferably 0.1 to 1 molar equivalent, to the pigment, which has a positive hole transporting property. The photosensitive member has a charge-transporting layer and can also have a protective layer. The pigment is a phthalocyanine series pigment, a squearyrium series pigment, or a perylene series pigment. A process of using the photosensitive member includes reversal development and multicolor toner transfer. It is found that the process is adaptable to change in size of the transfer medium.

Abstract: An electrophotographic photosensitive member has a charge-generating layer which includes selected photosensitive pigment particles and a compound which is a tetracyanoanthraquinodimethane compound, an anthraquinone compound, a dicyanovinyl compound, or a special quinone compound. The compound is incorporated in an amount in a range from 0.01 to 2 molar equivalents, preferably 0.1 to 1 molar equivalent, to the pigment, which has a positive hole transporting property. The photosensitive member has a charge-supporting layer and can also have a protective layer. The pigment is a phthalocyanine series pigment, a squearyrium series pigment, or a perylene series pigment. A process of using the photosensitive member includes reversal development and multicolor toner transfer. It is found that the process is adaptable to change in size of the transfer medium.

Abstract: A fluorene derivative useful as an electron transport material is disclosed, which is represented by formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom or a phenyl group, R.sub.2 represents a hydrogen atom, a nitro group, or an alkoxycarbonyl group, and R.sub.3 and R.sub.4 each represents a hydrogen atom or an alkyl group.

Abstract: A small-sized electric motor is provided with a hole for inserting a circuit breaker in a holder base lying between a motor case and a gear case, and the circuit breaker is fixed to the holder base by inserting its own body in the hole of the holder base together with terminals at the state in which the terminals are in contact with electrical connective plates of the circuit breaker respectively, it is possible to fix up the circuit braker to the holder base of the motor by merely press-fitting and becomes possible to automate the assembly of the motor housing and the built-in circuit breaker.

Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive substrate having thereon a photosensitive layer, wherein the photosensitive layer comprises at least one compound selected from the group consisting of a compound of formula (I), a compound of formula (II), and a compound of formula (III) as defined below: ##STR1## wherein X.sup.I represents a cyano group, an alkoxycarbonyl group, or an aryloxycarbonyl group; R.sup.I.sub.1 and R.sup.I.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, a nitro group, a halogen atom, or a cyano group; A.sup.I represents ##STR2## wherein R.sup.I.sub.3 and R.sup.I.sub.9 each represents a hydrogen atom, an alkyl group, a nitro group, a halogen atom, or a cyano group; and m and n each represents an integer of 0 to 3; ##STR3## wherein X.sup.II represents O, C(CN).sub.2 or C(CO.sub.2 R.sup.II).sub.2, wherein R.sup.II is an alkyl group; R.sup.II.

Abstract: An electrophotographic photoreceptor is disclosed, comprising an electrically conductive substrate having thereon and a light-sensitive layer, said light-sensitive layer comprising an electric charge generating layer and an electric charge transporting layer, wherein the electric charge generating layer contains an electric charge generating organic pigment having positive hole transporting properties and a pyrylium compound represented by the formula (I) or (II): ##STR1## wherein X is an oxygen atom or a sulfur atom; R.sub.1 to R.sub.5 are each a hydrogen atom, and alkyl group, a cycloalkyl group, an alkoxycarbonyl group, a benzyl group, a substituted or unsubstituted styryl group, or a substituted or unsubstituted phenyl group, and Z.sup..crclbar. is an anion.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate and a photosensitive layer on the conductive substrate, wherein the photosensitive layer contains a compound of formula (I) as a charge transporting agent: ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a nitro group, a halogen atom, an alkylcarbonyl group or an arylcarbonyl group; Y represents ##STR2## X.sub.1 and X.sub.2 may be the same or different groups and are selected from a cyano group or an alkoxycarbonyl group; Z represents ##STR3## R.sub.3 represents a substituted or unsubstituted aryl or nitrogen-containing heterocyclic group; R.sub.4, R.sub.5 and R.sub.6 each represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group or a heterocyclic group; when Z is the ##STR4## group, R.sub.1 and R.sub.2 are not the alkylcarbonyl group; m is 0 or 1; n is 0 to 2; and when n is 2, the R.sub.

Abstract: Fluorene derivatives represented by the general formula (I): ##STR1## wherein R represents an alkyl group having 1 to 8 carbon atoms, a phenyl group of a C.sub.1 -C.sub.8 alkyl-substituted phenyl group, and a process for preparation thereof. These fluorene derivatives are synthesized by reacting fluorenone derivatives represented by the general formula (II): ##STR2## wherein R is the same as defined above, with malonitrile.

Abstract: Benzophenone derivatives which are useful in electrophotographic light-sensitive material represented by formula (I): ##STR1## wherein A represents the structural formula (a), (b) or (c): ##STR2## and R represents an alkyl group having 1 to 8 carbon atoms or a nitro group, and a process for preparation thereof. These benzophenone derivatives can be synthesized by reacting compounds represented by formula (II): ##STR3## wherein A and R are the same as defined above, with malonitrile.

Abstract: An electrophotographic photosensitive member has a charge-generating layer which includes selected photosensitive pigment particles and a compound which is a tetracyanoanthraquinodimethane compound, an anthraquinone compound, a dicyanovinyl compound, or a special quinone compound. The compound is incorporated in an amount in a range from 0.01 to 2 molar equivalents, preferably 0.1 to 1 molar equivalent, to the pigment, which has a positive hole transporting property. The photosensitive member has a charge-transporting layer and can also have a protective layer. The pigment is a phthalocyanine series pigment, a squarylium series pigment, or a perylene series pigment. A process of using the photosensitive member includes reversal development and multicolor toner transfer. It is found that the process is adaptable to change in size of the transfer medium.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having provided thereon a photoconductive layer containing, as a charge transport material, a compound represented by formula (I) ##STR1## wherein R.sub.1 represents an alkyl group, and R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, or a substituted amino group. The photoreceptor satisfies both electrical and mechanical requirements without undergoing adverse influences from binder resins used therein.

Abstract: An electron-accepting compound represented by the formula (I): ##STR1## wherein R represents a hydrogen atom or --B(Mes).sub.2 and Mes represents a mesityl group.A method for preparing an electron-accepting compound represented by the above-described formula (I), which comprises condensing a benzophenone derivative represented by the following formula (II) with malononitride, ##STR2## wherein R and Mes have the same meanings as defined for the formula (I).

Abstract: An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photosensitive layer composed of a charge generating layer and a charge transport layer, wherein said charge generating layer contains a bisazo compound represented by formula (I) ##STR1## wherein X, Y, and A are defined in the specification, and said charge transport layer contains a benzidine compound represented by formula (II) ##STR2## wherein R.sub.1, R.sub.2, and R.sub.3 are as defined in the specification. The photoreceptor exhibits high photoresponse performance even in a weak electric field and exhibits high sensitivity in a visible light region.