Abstract: A thermosetting solution composition composed of a biphenyltetracarboxylic acid compound containing a partial lower aliphatic alkyl ester of 2,3,3?,4?-biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2?,3,3?-biphenyltetracarboxylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, a partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound, and an organic solvent composed of a lower aliphatic alcohol is of value for manufacture of a prepreg.

Abstract: A thermosetting solution composition composed of a biphenyltetracarboxylic acid compound containing a partial lower aliphatic alkyl ester of 2,3,3?,4?-biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2?,3,3?-biphenyltetracarboxylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, a partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound, and an organic solvent composed of a lower aliphatic alcohol is of value for manufacture of a prepreg.

Abstract: A polyimide powder for an antistatic polyimide molded product is disclosed. The polyimide powder comprises a polyimide-powder prepared from an aromatic tetracarboxylic acid component and a diamine component, and a conductive carbon black having a DBP oil absorption of 300 ml/100 g or more; wherein the amount of the conductive carbon black is within a range of 0.75 wt % to 5 wt % relative to the polyimide-powder. A polyimide molded product with sufficient antistatic property can be formed by molding the above polyimide powder.

Abstract: A polyimide powder for an antistatic polyimide molded product is disclosed. The polyimide powder comprises a polyimide-powder prepared from an aromatic tetracarboxylic acid component and a diamine component, and a conductive carbon black having a DBP oil absorption of 300 ml/100 g or more; wherein the amount of the conductive carbon black is within a range of 0.75 wt % to 5 wt % relative to the polyimide-powder. A polyimide molded product with sufficient antistatic property can be formed by molding the above polyimide powder.

Abstract: An apparatus includes a case including a surface, a bottom face and a first hole arranged on the bottom face; a first connector on the bottom face of the case; and a guide pin arranged in the first hole and being capable of moving in the first hole.

Abstract: A storage device sends its storage-device-specific information A to a client apparatus. The client apparatus generates an encryption key P1, using client-apparatus key generation information B1 specific to the client apparatus and the received information A. The client apparatus generates information D? by encrypting its client-apparatus-specific information D, using the encryption key P1, and sends the information D? to the storage device. The storage device stores the information D?. When the storage device authenticates a client apparatus, the storage device has the client apparatus generate information D? through the process as described above and judges whether or not the information D? stored in the storage device matches the information D? generated by the client apparatus being examined.

Abstract: According to an optical fiber splicing technique in which optical fibers F11 and F12 respectively connected to optical members 3 and 4 of an optical member unit are connected by fusion splicing, the plurality of optical fibers F11 and F12 and a looped turn-around fiber F21 are positioned facing each other and connected by fusion splicing, to connect the plurality of optical fibers F11 and F12 with each other.

Abstract: An agitating device for agitating the exhaust gas of an engine includes a base plate having a plurality of through holes that are defined by radially extending spoke portions and a ring-like rim portion and are arranged in a circular pattern in a circumferential direction of the base plate, and a plurality of fins expanding from the respective spokes on a slant with respect to the base plate. The base plate is fixed in the exhaust passage by the rim portion being jointed to the exhaust passage at welded portions. The welded portions are each disposed in an area between respective two adjacent spoke portions in the circumferential direction of the base plate, and an outer edge of the rim portion positioned on the outer side of the rim portion in extending directions of the spoke portions is located next to the exhaust passage with a gap provided therebetween.

Abstract: A plating solution recovery apparatus for electroplating, the apparatus comprises a circulation tank; a sludge removing device; a concentrating device; an iron compound crystallizing device; an iron compound separating device; an iron compound redissolving device; an iron ion removing device; pipelines sequentially connecting the circulation tank, the sludge removing device, the concentrating device, the iron compound crystallizing device, the iron compound separating device, the iron compound redissolving device, and then the iron ion removing device in a downstream direction from a base point coincident with the circulation tank; a pipeline connecting from the iron ion removing device to the circulation tank; a pipeline connecting from the iron compound separating device to the circulation tank; and a flow path changing device connecting to the circulation tank and provided in at least one portion selected from a group of portions, respectively, between the sludge removing device and the concentrating devic

Abstract: A thermosetting solution composition composed of a biphenyltetracarboxylic acid compound containing a partial lower aliphatic alkyl ester of 2,3,3?,4?-biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2?,3,3?-biphenyltetracarboylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, a partial lower aliphatic alkyl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound, and an organic solvent composed of a lower aliphatic alcohol is of value for manufacture of a prepreg.

Abstract: A water-soluble polyimide precursor, which can be suitably applied for aromatic polyimides and exhibits a low reduction in heat resistance and mechanical properties, an aqueous solution of the polyimide precursor and a polyimide obtained from the precursor. A heat-resistant fiber impregnated material and an impregnated sheet-like material are prepared by using the precursor and a laminate is prepared by employing the precursor.

Abstract: An alignment tool includes a holding member designed to hold parallel optical fibers. A first movable member is coupled to the holding member for relative movement. The first movable member is designed to hold one of the optical fibers. A second movable member is located for a movement relative to the first movable member. The second movable member is designed to hold another one of the optical fibers. The second movable member is capable of moving relative to the first movable member. The interval can be changed between the optical fibers held on the first and second movable members in response to the relative movement of the second movable member. In this case, the predetermined interval can be kept between the optical fibers on the holding member.

Abstract: A thermosetting solution composition composed of a biphenyltetracarboxylic acid compound containing a partial lower aliphatic alkyl ester of 2,3,3?,4?-biphenyltetracarboxylic acid and/or a partial lower aliphatic alkyl ester of 2,2?,3,3?-biphenyltetracarboxylic acid, an aromatic diamine compound in a molar amount larger than a molar amount of the biphenyltetracarboxylic acid compound, a partial lower aliphatic aryl ester of 4-(2-phenylethynyl)phthalic acid compound in a molar amount as much as 1.8-2.2 times a molar amount corresponding to a difference between the molar amount of the aromatic diamine compound and the molar amount of the biphenyltetracarboxylic acid compound, and an organic solvent composed of a lower aliphatic alcohol is of value for manufacture of a prepreg.

Abstract: A polyimide powder for an antistatic polyimide molded product is disclosed. The polyimide powder comprises a polyimide-powder prepared from an aromatic tetracarboxylic acid component and a diamine component, and a conductive carbon black having a DBP oil absorption of 300 ml/100 g or more; wherein the amount of the conductive carbon black is within a range of 0.75 wt % to 5 wt % relative to the polyimide-powder. A polyimide molded product with sufficient antistatic property can be formed by molding the above polyimide powder.

Abstract: A housing-remover tool for a press-fit connector. The tool including shoulder part pressers for pressing the shoulder parts of pin-shaped terminals, each shoulder part presser having a hollow part for receiving a pin part of the pin-shaped terminal and a cut-away part at a leading end for engaging with the shoulder part; a first sub-assembly for insertion inside a housing of the connector and provided with through-holes for receiving the shoulder part pressers; and a second sub-assembly having a pair of engagement members having engaging protrusions which can engage with stepped parts of the housing and a lifting portion for lifting the engagement members along the side surfaces of the first sub-assembly.

Abstract: A water-soluble polyimide precursor, which can be suitably applied for aromatic polyimides and exhibits a low reduction in heat resistance and mechanical properties, an aqueous solution of the polyimide precursor and a polyimide obtained from the precursor. A heat-resistant fiber impregnated material and an impregnated sheet-like material are prepared by using the precursor and a laminate is prepared by employing the precursor.

Abstract: A foamed polyimide shaped article having heat resistance and molded to any shape obtained by molding and then calcining a mixture of pulverized pieces of a pre-foamed polyimide resin mass and a heat resistant binder and a process for production of the same comprising pulverizing a pre-foamed polyimide resin mass, mixing the pulverized pieces with a heat resistant binder, molding the mixture to a predetermined shape, then calcining it at a temperature of at least 350° C. to cure the binder and strongly bond the polyimide foam mass.

Abstract: A press-fit connector including a housing provided with a plurality of through-holes and pins secured to the housing by forcing shoulder parts of the pins into the through-holes is proposed. The through-holes are configured such that gaps are formed between the shoulder parts and inner walls of the through-holes. A housing-remover tool for such a press-fit connector is also proposed.

Abstract: A polyimide/metal composite sheet is composed of a metal film and a polyimide film polyimide which is prepared by reaction of asymmetric biphenyltetracarboxylic acid dianhydride and 1,3-bis(4-aminophenoxy)benzene. The polyimide film is firmly bonded to and hardly peelable from the metal film. The polyimide film can contain a solid filler.

Abstract: An antistatic film with a surface resistivity of 1013 &OHgr;/□, comprising a metal oxide and conductive ultrafine particle mixed layer formed on the surface of a film, and a process for manufacture of the antistatic film which comprises coating the surface of a self-supporting film, obtained by casting and drying a solution of a heat-resistant resin precursor, with a mixture obtained by uniformly combining a metal compound which converts to a metal oxide upon heating, conductive ultrafine particles and a solvent, and then heating it to dryness, removing the solvent and cyclizing the heat-resistant resin precursor. The film exhibits improved antistatic retention with no reduction in its original mechanical properties and formed without the use of special equipment such as a sputtering apparatus, as well as a process for its manufacture.