Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.

Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.

Abstract: Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester.

Abstract: A camera 120 for imaging a call-sender, a monitor 110 for projecting the call-receiver who is the party on the other end of the phone and a transceiver 140 used for the call are provided. The transceiver 140 comprises a mike 14a for collecting the voice of the call-sender and a speaker 14b for outputting the voice of the call-receiver. A caption image (an arrow 150) is indicated on the monitor 110 for directing the caller's line of sight to the camera 120 and a light flashing system 130 is provided on the periphery of the camera 120.

Abstract: The information terminal body may be designed to foldably pivot a pair of flat cases each having a display unit through a hinge which is equipped with a photographing optical system for the camera function unit of which optical axis of lens is perpendicular to an axial center of the hinge. The display units display information from communication channels and images taken in by the camera. The cases may have the display units such that the display units face outside in a folded state. At least one of the two display units may be a finder for photographers, while the other may be a finder for the subject persons. The terminal is equipped with a shutter button and a terminal operation button. The terminal operation button works also as a shutter button. The information terminal is also equipped with a viewfinder for the camera lens system.

Abstract: A relief valve for an oil filter device integrally formed with a check valve has an annular shape, and has a front end portion, a guiding portion, a sealing portion, a recess portion, and a groove portion. The relief valve is attached to a protector only by inserting a cylindrical protector end portion into the groove portion thereof. At this time, the recess portion is elastically deformed so that the sealing portion moves inwardly, while the sealing portion is elastically compressed by the protector end portion. As a result, the relief valve closes an oil flow passage defined in a wall of the protector end portion only by an elastic deformation stress thereof. The relief valve can be readily molded and attached to the oil filter device and stably provide desired valve opening characteristics.

Abstract: A protector for holding a filter medium thereon is made of resin and composed of a plurality of pillar members. The pillar members are disposed in parallel with each other in a longitudinal direction thereof and forming a circular shape with intervals respectively between adjacent two pillar members. Accordingly, the protector can be easily manufactured by molding and can be easily scrapped after its use. The protector further has a positioning member for positioning the protector in a case. Accordingly, a number of parts in a filter device can be reduced, resulting in a decrease in man-hours for assembling the parts.

Abstract: A data transmission unit for transmitting data stored in a movable terminal unit to an upper unit when the movable terminal unit is connected to the data transmission unit, includes a coupler for directly coupling the unit to a front or a rear stage data transmission unit without using a connecting cable. The coupler includes data pins for passing data from the movable terminal unit or the front stage data transmission unit to the rear stage data transmission unit or the upper unit, saving the space between adjacent units.

Abstract: A cordless telephone system in which a battery of a mobile unit can be charged with use of a cordless charger. The charger, which is provided separately from a base unit, has a chargeable battery which is larger in current capacity than the battery within the mobile unit. When the mobile unit is mounted on the charger, the battery of the mobile unit is charged with the battery of the charger. So long as the charge level of the battery within the charger is sufficiently high, the battery of the mobile unit is charged with the battery of the charger and without use of a commercial AC power source.

Abstract: A cordless telephone apparatus adapted to produce a ringer tone from a connection device during power stoppage. The ringer circuit is rendered inoperative when the connection device and cordless telephone are connected via a radio circuit in response to an incoming call from a subscriber's line, and rendered operative in at least one of the two cases in which the connection device and the cordless telephone are not connected via the radio circuit in response to an incoming call from the subscriber's line and in which the power source stops supplying power.

Abstract: An apparatus producing continuously electrolyzed water is so constructed that the ratio R.sub.2 /R.sub.1 of the intake amount of cathode water containing abundantly alcali ions to the intake amount of anode water containing abundantly acid ions with respect to that of city water supplied to the electrolytic cell is increased.

Abstract: A filter element which is improved in filter performance and suitable for use in various types of filters, and a manufacturing method thereof. In the filter element, a multiplicity of tubes each formed of a filtering material and having a substantially circular shape in cross-section are arranged side by side into a tubular assembly with the axes of the tubes lying parallel to one another; inter-tube openings are closed at one end of the tubular assembly which end serves as the inlet side for a fluid to be filtered, whereas intra-tube openings are closed on the opposite end of the tubular assembly; and the total cross-sectional area of all the inter-tube openings is set smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to the tubular assembly.

Abstract: A length-measuring apparatus is provided with memory for storing scale reduction data of a map and for storing unit data of length. Actual distance is calculated by calculation circuit when a rotating member is moved to roll along a point-to-point course on the map. Distance data expressed in unit corresponding to the above unit data of length is obtained. A plurality of distance data obtained by the above calculation circuit can be stored in memory together with the unit data of length and also can be displayed on display by operation of the display switch.

Abstract: A filter element which is improved in filter performance and suitable for use in various types of filters. In the filter element, a multiplicity of tubes each formed of a filtering material and having a substantially circular shape in cross-section are arranged side by side into a tubular assembly with the axes of the tubes lying parallel to one another; inter-tube openings are closed at one end of the tubular assembly which end serves as the inlet side for a fluid to be filtered, whereas intra-tube openings are closed on the opposite end of the tubular assembly; and the total cross-sectional area of all the inter-tube openings, is set smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to the tubular assembly.