Abstract: A water based ink composition for a writing instrument containing at least one selected from the group consisting of a polyoxyethylene alkyl ether phosphate and salts thereof and further containing a colorant, a perfume and water, which is less liable to cause feathering of the lines and in which a perfume is dispersed and retained in an aqueous medium in a stable state and the fragrance lasts long.

Abstract: A water based ink composition for a writing instrument containing an N-acylglutamic acid ester and further containing a colorant, a perfume and water, which is less liable to cause feathering of the lines and in which a perfume is dispersed and retained in an aqueous medium in a stable state and the fragrance lasts long.

Abstract: A water based ink composition for a writing instrument containing a lecithin derivative and further containing a colorant, a perfume and water, which is less liable to cause feathering of the lines and in which a perfume is dispersed and retained in an aqueous medium in a stable state and the fragrance lasts long.

Abstract: A writing implement with an ink collector is able to prevent ink soiling at the pen tip even when the writing implement has been left under an atmosphere of 0° C. or below, at which the ink inside the writing implement will begin freezing and can be assembled by a simple assembling machine with its productivity improved. This writing implement with an ink collector is a direct ink storage type writing implement having an ink chamber 2 disposed at the rear part of a barrel cylinder 1 for directly storing the ink and an ink collector 5 mounted at the front part of barrel cylinder 2 and is characterized in that ink collector 5 is formed with a passage hole 6 therein in which an ink conduit core 8 for conveying the ink from ink chamber 2 to a pen tip 10 is provided while the flank of ink collector 5 is formed with air holes 7 that communicate with passage hole 6.

Abstract: A ball-point pen is so configured that an elastic body is installed in a state that it cannot be pulled out such that it can push a ball at the point at all times directly or indirectly via a movable member, satisfying a relation 20·W<P<75·W between a projection area W (mm2) of a diameter of a writing ball and a pushing force P (g) of an elastic body. Moreover, the effect can be increased by restricting a return load and materials.

Abstract: A direct-feed type writing implement includes: a point assembly having a writing point at the tip thereof; an ink tank directly storing a relatively low viscosity ink having a viscosity of 2 to 100 mPa·S at room temperature; an ink collector for adjusting the internal pressure in the ink tank by utilizing capillarity; a feeder including a center core, for feeding ink from the ink tank to the writing point; a duct pipe connecting the ink collector and the ink tank; and a duct pipe ink storage portion provided for the duct pipe. In another embodiment, ink is supplied to the center core as the ink feeder only through the duct pipe.

Abstract: A medical puncturing device for a so-called indwelling needle, includes: an indwelling needle composed of an indwelling outer needle element of a soft synthetic resin capillary tube and a puncturing inner needle element of a metallic capillary tube fitted through the outer needle element; and an outer sleeve for incorporating the indwelling needle. The indwelling needle has a projected part on the periphery at the rear end thereof while the outer sleeve has a guide slot cut along the axial direction on the peripheral surface thereof. The projected part is fitted through the guide slot and can move forward and backward so as to project and retract the indwelling needle with respect to the front side of the outer sleeve. The device further has locking arrangements in the front and rear ends of the guide slot so as to keep the indwelling needle at the projected and retracted positions.

Abstract: Provided is a water based white color tone pigment ink for a ballpoint pen comprising titanium oxide, a complementary colorant comprising a pigment or a pseudo pigment obtained by dyeing resin particles with a dye, a resin emulsion, a thickener, water, a polar solvent and other additives, wherein the pigment has an average particle diameter of 100 nm or more; the pseudo pigment has an average particle diameter of 200 nm or more; the resin contained in the resin emulsion has an average particle diameter of 200 nm or more; and the ink has a viscosity of 500 mPa·s to 5000 mPa·s. Vivid drawn lines having a poster color tone can be obtained well even on writing paper having a dark hue. The ink is stable even in long term storage and excellent in a follow-up property and can write continuously.

Abstract: Provided is an ink composition for a water based ballpoint pen which satisfies all of no change in the ink composition even in storage over a long period of time, a good strike-through property and an excellent drawn line-drying property at the same time.

Abstract: A direct-feed type writing implement includes: a point assembly having a writing point at the tip thereof; an ink tank directly storing a relatively low viscosity ink having a viscosity of 2 to 100 mPa.S at room temperature; an ink collector made up of a multiple number of vanes for adjusting the internal pressure of the ink tank by utilizing capillarity; a feeder including a center core, for feeding ink from the ink tank to the writing point; an ink absorber connected to the center core as the ink feeder; and a duct pipe connecting the ink collector and the ink tank; and preferably, ink is supplied to the center core as the ink feeder only through the ink absorber and the duct pipe.

Abstract: A process for producing a self-inking stamp capable of stamping repeatedly by filling ink in a stamp material having a continuous porous structure, wherein the stamp material having a continuous porous structure is provided with an occlusion body having a continuous porous structure and being impregnated with two or more kinds of ink having different functions so as to infiltrate two or more kinds of ink into the stamp material. In the process, there is used an occlusion body having a physical barrier and/or an isolation part which suppresses or inhibits mingling of two or more kinds of ink having different functions, and a self-inking stamp produced by the process.

Abstract: A water based ink composition for a writing instrument containing at least one selected from the group consisting of alkylene oxide adducts of polyglycerin, alkylene oxide adducts of glycerin and alkylene oxide adducts of trimethylolpropane and further containing a colorant, a perfume and water, which is less liable to cause feathering of the lines and in which a perfume is dispersed and retained in an aqueous medium in a stable state and the fragrance lasts long.

Abstract: An indwelling needle includes: a container barrel having a retraction mechanism (an actuator and urging element etc.,) for retracting the inner needle after use; and an outer needle support lid element for prohibiting the outer needle from being withdrawn into the container barrel. The outer needle support lid element has a gutter-like portion, which is a short cylinder formed in part with a cutout portion with its inside dimension designed so as to allow the inner needle to pass therethrough and be smaller than the outside dimension of the needle base (more exactly, the outer dimension of the flange of the needle base) of the outer needle.

Abstract: Provided is a free ink type writing instrument having an ink tank part for storing an ink, in which an amount of the ink can visually be observed. The free ink type writing instrument is characterized by that the whole or a part of an internal surface part in contact with the ink in the ink tank part has a smaller critical surface tension than a surface tension of the ink, and a contact angle between the ink and the whole or a part of the internal surface part in contact with the ink in the ink tank part is 30° or more at a temperature of 25° C.

Abstract: A liquid applicator has a vaned collector. The collector's rear end is abutted on a partition having a concave portion, creating a gap B therebetween. A cylindrical projection is formed inside the rear sleeve concentrically on its axis so that a replaceable cartridge holding ink is removably attached with its front end fitted to the cylindrical projection. A trunk core's rear end is inserted into a communication passage that is formed in the cylindrical projection with a gap A formed between the trunk core surface and the wall surface of the communication passage. This gap A is put in communication with an ink slit of the collector via gap B. Grooves are formed in the convex portion while a number of ribs are formed apart with respect to a barrel's circumference on inner peripheral surface of the communication passage of the cylindrical projection. These ribs stably support the rear end of the trunk core.

Abstract: A process for producing a self-inking stamp capable of stamping repeatedly by filling ink in a stamp material having a continuous porous structure, wherein the stamp material having a continuous porous structure is provided with an occlusion body having a continuous porous structure and being impregnated with two or more kinds of ink having different functions so as to infiltrate two or more kinds of ink into the stamp material. In the process, there is used an occlusion body having a physical barrier and/or an isolation part which suppresses or inhibits mingling of two or more kinds of ink having different functions, and a self-inking stamp produced by the process.

Abstract: A double ended direct-feed type writing implement includes: an ink tank; a pair of writing points (point assemblies) arranged both ends of the ink tank; ink collectors; an ink feeder means including a center core; arrangement for inhibiting air from flowing into the ink tank through the ink collector air/liquid exchanger located at the top while the pen is unused for writing.

Abstract: Provided is an ink composition comprising at least a colorant and water, wherein the ink composition further contains 0.5 to 15% by weight of reduced dextrin or reduced maltodextrin based on the total weight of the ink composition. It is a water based ink composition for a ball point pen which is excellent in dryout resistance and is safe and which does not cause a fluctuation in a viscosity and a pH with the passage of time.

Abstract: An action of the preventing drying at a pen tip without using water-soluble organic solvents such as glycols, glycerin and glycol ethers which have so far been used for a water based ink for a ball point pen is allotted to at least one selected from the group consisting of a reducing sugar comprising maltitol as a principal component, a reducing sugar comprising sorbitol as a principal component, reducing dextrin, reducing maltodextrin, &agr;-cyclodextrin, &bgr;-cyclodextrin and maltosylcyclodextrin, and the actions of inhibiting feathering of the drawn lines, improving discharge stability of the ink and maintaining the lubricity are allotted to at least one selected from the group consisting of an alkylene oxide adduct of polyglycerin, an alkylene oxide adduct of glycerin and an alkylene oxide adduct of trimethylolpropane.

Abstract: In a free-ink type low-viscosity water-based ball point pen, the low viscosity water based ink 17 contains 40% or more of water as a main solvent and has a viscosity of 1.5 cps to 60 cps at a normal temperature. A collector 6 has a slender, slit-like ink groove 16 and an air vent groove 14. In a zone covering from a collector air-venting portion 15 to an outside air with which the collector air-venting portion 15 is communicated the collector 6 has a mouth piece 5 having provided therein the thin and elongate air vent groove 14. The maximum amount of ink stored in the collector 6 is made 15% or more of the capacity of an ink tank 9. The ink tank 9 is made detachable and has its main body formed of transparent or semi-transparent synthetic resin, the main body therefore enabling a residual amount of ink 17 to be visually recognizable from outside.