Abstract: In a writing instrument in which an ink for a writing instrument such as a water-based ink and an oil-based ink impregnated into an ink occlusion body in a barrel is fed to a pen tip in a writing part, in order to provide a writing instrument in which a sign of exhausting the ink can readily and surely be detected, the above writing instrument is provided with a structure in which the ink impregnated into the ink occlusion body in the barrel is fed to the pen tip in the writing part, wherein the ink impregnated into the ink occlusion body described above is fed to the pen tip via an ink guiding feed having visibility, and a sign of exhausting the ink fed from the ink occlusion body is detected by visually observing the ink guiding feed described above via a visible part formed in the barrel.

Abstract: In a writing instrument in which an ink for a writing instrument such as a water-based ink and an oil-based ink impregnated into an ink occlusion body in a barrel is fed to a pen tip in a writing part, in order to provide a writing instrument in which a sign of exhausting the ink can readily and surely be detected, the above writing instrument is provided with a structure in which the ink impregnated into the ink occlusion body in the barrel is fed to the pen tip in the writing part, wherein the ink impregnated into the ink occlusion body described above is fed to the pen tip via an ink guiding feed having visibility, and a sign of exhausting the ink fed from the ink occlusion body is detected by visually observing the ink guiding feed described above via a visible part formed in the barrel.

Abstract: A direct methanol fuel cell comprises a multiple number of connected unit cells, each composed of a fuel electrode element of a microporous carbon material, an electrolyte layer formed on the outer surface of the fuel electrode element, an air electrode layer formed on the outer surface of the electrolyte layer, wherein each unit cell is supplied with fuel from a fuel reservoir through a fuel feeder having an infiltration structure coupled therebetween.

Abstract: A direct methanol fuel cell comprises a multiple number of connected unit cells, each composed of a fuel electrode element of a microporous carbon material, an electrolyte layer formed on the outer surface of the fuel electrode element, an air electrode layer formed on the outer surface of the electrolyte layer, wherein each unit cell is supplied with fuel from a fuel reservoir through a fuel feeder having an infiltration structure coupled therebetween.

Abstract: A direct methanol fuel cell comprises a multiple number of connected unit cells, each composed of a fuel electrode element of a microporous carbon material, an electrolyte layer formed on the outer surface of the fuel electrode element, an air electrode layer formed on the outer surface of the electrolyte layer, wherein each unit cell is supplied with fuel from a fuel reservoir through a fuel feeder having an infiltration structure coupled therebetween.

Abstract: A gas-pressurized writing instrument simply constructed so that a compressed gas will not escape to the outside by providing a writing point assembly (10) at the front end (14a) of a tube member (14), storing an ink (12) to be fed to the writing point assembly (10) in the tube member (14), encasing at least part of the tube member (10) by a casing cylinder (18) so as to form a space (16) communicating with the rear opening of tube member (14), and sealing a compressed gas inside the space (16) so that the compressed gas will push the ink out to writing point assembly (10) to secure the writing performance, wherein the casing cylinder (18) is formed of a material that presents low gas permeability or gas impermeability.

Abstract: A water-based ink composition for a ballpoint pen containing at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of 60° C. or higher. The average particle diameter of the non-colored particles is preferably to 0.01 to 10 ?m. The ink composition preferably includes at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition.

Abstract: A gas-pressurized writing instrument simply constructed so that a compressed gas will not escape to the outside by providing a writing point assembly (10) at the front end (14a) of a tube member (14), storing an ink (12) to be fed to the writing point assembly (10) in the tube member (14), encasing at least part of the tube member (10) by a casing cylinder (18) formed of a material that presents low gas permeability or gas impermeability so as to form a space (16) communicating with the rear opening of tube member (14), sealing a compressed gas inside the space (16) so that the compressed gas will push the ink out to writing point assembly (10) to secure the writing performance, and covering the outer periphery of the casing cylinder (18) with an exterior member having thermal resistance or/and moisture resistance greater than that of the casing cylinder so that the casing cylinder can present low gas permeability or gas impermeability.

Abstract: A follower for a nonaqueous ballpoint pen, comprising at least one poly-?-olefin which is a synthetic oil having a viscosity of 200 mPa·s or more at 40° C., wherein the total amount of poly-?-olefins is 80 mass % or more of all components, the viscosity at 40° C. is from 1,000 to 30,000 mPa·s, and the shear-thinning index at a shear rate of 1 to 10/s is 0.95 or more. A follower for a nonaqueous ballpoint pen can be used also for a nonaqueous ballpoint pen using a solvent having a high vapor pressure and causes no problem even when the follower is mounted in an ink reservoir tube with strong tube resistance having an inner diameter of 2.8 mm or less.

Abstract: A writing point assembly and an ink tube and/or a holder can be welded appropriately at a predetermined area without using ultrasonic waves, so as to be able to prevent dislodging of the writing point assembly, ink leakage and the like. The rear end part, of a metallic writing point assembly as a part of a writing instrument, is inserted into a joint, and is heated at the predetermined area (at least the fitted area in contact with the front end part of the joint), so as to weld the predetermined area of the writing point assembly to the surrounding part of the joint.

Abstract: A water-based ink composition for a ballpoint pen containing at least colored resin particles which have an average particle diameter of 2 to 20 ?m and which are non-thermoplastic in a proportion of 5 to 30% by weight based on the total amount of the ink composition and non-colored particles having a glass transition point of lower than 0° C. The average particle diameter of the non-colored particles is controlled preferably to 0.01 to 10 ?m. The composition preferably includes at least one selected from ethylene oxide or propylene oxide adducts of glycerin and ethylene oxide or propylene oxide adducts of diglycerin in a proportion of 1 to 30% by weight based on the total amount of the ink composition.

Abstract: Provided is a writing instrument comprising an ink tank, an ink holder which can hold an ink, a pen tip, an ink guiding part for guiding the ink in the ink tank to the pen tip and an ink occlusion body which can feed the ink to the ink guiding part and which has an outer skin, wherein through parts are provide in the outer skin of the ink occlusion body.

Abstract: An ink follower for a ballpoint pen using a water-based ink in which a value of the test for oil separation (60° C., 24 hours) according to JIS K 2220-5.7-1993 is 0.5 to 12% and which has a viscoelasticity predominant in an elastic response or a value of tan ? of 0.1 to 1.5 at a temperature of 25° C. and in the full frequency range of an angular frequency of 0.1 to 630 rad/sec, and it contains as a base oil, a non-water-soluble organic solvent having a viscosity of 5 Pas·sec or less at a temperature of 25° C. and a shearing speed of 1 to 400 sec?1. Polybutene, mineral oil and silicone oil can be used as the base oil.

Abstract: A follower for a nonaqueous ballpoint pen, comprising at least one poly-?-olefin which is a synthetic oil having a viscosity of 200 mPa·s or more at 40° C., wherein the total amount of poly-?-olefins is 80 mass % or more of all components, the viscosity at 40° C. is from 1,000 to 30,000 mPa·s, and the shear-thinning index at a shear rate of 1 to 10/s is 0.95 or more. According to the present invention, a follower for a nonaqueous ballpoint pen is provided, which can be used also for a nonaqueous ballpoint pen using a solvent having a high vapor pressure and causes no problem even when the follower is mounted in an ink reservoir tube with strong tube resistance having an inner diameter of 2.8 mm or less. Also, a nonaqueous ballpoint pen is provided, which comprises this follower for a nonaqueous ballpoint pen and a nonaqueous ballpoint pen ink using a solvent having a high vapor pressure and in which the inner diameter of the ink reservoir tube is 2.8 mm or less.

Abstract: An ink reservoir for a Writing instrument molded from a gas barrier resin such as polyvinyl alcohol, an ethylene vinyl alcohol copolymer resin, polyacrylonitrile, polyamide, a cellulose resin, polyester, polycarbonate and polystyrene, wherein a vapor-scarcely permeable coating layer having a vapor permeability (P1) of 0.5 g/m2* atm*24hr/25 ?m or less at 40° and 90% RH is formed on the above reservoir for a writing instrument. In this ink reservoir for a writing instrument, a gas barrier property is not reduced under the environment of high moisture even if a wall of the ink reservoir is relatively thin and a resin having an excellent transparency is used, and releasing of pressurized air in the ink reservoir and falling of the tip member are not caused.

Abstract: The object of the present invention is to provide a cartridge type applicator which can prevent the application liquid from flowing back from the applying portion into the cartridge and which is suitable for use with a high viscosity application liquid. This applicator includes an advancing mechanism or piston mechanism made up of a sealing plug disposed inside a cylindrical cartridge tank for constituting the rear end wall of the tank, and a rod member attached to the sealing plug for causing the sealing plug to move in the axial direction of the tank; and an actuator (actuating member) for causing the rod member to move or advance in the axial direction by rotation thereof, and is constructed such that, when the actuator is turned, the rod member causes the sealing plug to move in the axial direction so as to reduce the volume of the space inside the tank.

Abstract: Provided is a writing instrument in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property, wherein a fluorine base surfactant and/or a silicone base surfactant are added to an ink for the above writing instrument, and/or a substance which is solid at room temperature and has a solubility of 5% or less in an ink solvent at room temperature and which has a polar functional group is added to the coating agent, whereby the writing instrument having an excellent cap-off performance can be obtained.

Abstract: Provided are an ink composition for a pressurized ballpoint pen and a pressurized ballpoint pen which are excellent in a writing property and do not cause ink leakage and which are suited to handwriting. The ink composition for a pressurized ballpoint pen described above comprises at least a colorant, a solvent and silica, wherein a coagulated matter containing at least silica is contained therein, and the ink composition has a viscosity of 10000 to 40000 mPa·s at 25° C. Also, provided is the pressurized ballpoint pen equipped with a refill, in which pressurized gas is charged into an ink reservoir charged with the ink composition for a pressurized ballpoint pen described above and a closed vessel containing the reservoir.

Abstract: A writing instrument cap having a clip as a separate part. The clip attachment, to which the clip is fitted, is projectively formed on the outer periphery of the cap. The clip attachment is formed with a vent hole penetrating between the interior and exterior of the cap and raised portions for attachment of the clip. The raised portions are provided on both sides of the vent hole, with respect to the circumference of the cap. When the clip is attached to the clip attachment, the clip covers the clip attachment and the vent hole and creates a clearance between the clip interior and the clip attachment so as to establish an air passage that communicates between the vent hole and the outside atmosphere.

Abstract: The mechanism includes: an urging means for urging an inner needle (12) to the side opposite to an outer needle (11) with respect to the axial direction of a holder sleeve (1) for holding the inner needle (12); an actuator (6) which is positioned between the urging means (8) and inner needle (12), moves together with the inner needle (12) and has a puncture position retainer for keeping the inner needle (12) and outer needle (11) ready for puncture and an inner needle retraction actuating portion for allowing for the retraction actuation of the inner needle (12); and a slit (2) for assuring the path of movement of the actuator (6). The puncture position retainer has a puncture position engagement portion whereby the actuator (6) is engaged with the holder sleeve (1) at a position on the outer needle side (11).