Patents Assigned to Mitsubishi Pencil Kabushiki Kaisha
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Patent number: 6966718Abstract: A writing instrument includes a front barrel and an ink tank. When, with a rear barrel for accommodating the ink tank removably fitted on the ink tank, a cap formed to cover the front barrel is fitted on the front barrel, the cap is positioned and fastened by abutment of the opening end of the cap. The cap has a hollow for accommodating a point assembly. The inside diameter of the hollow exceeds the outside diameter of the front barrel and the outside diameter of a rear end of the rear barrel. A barrel hold is formed along the circumference on the inner wall portion of the cap, so that the barrel hold grips the outer periphery of the rear end of the rear barrel. A guide portion is formed on the inner wall portion of the cap, closer to the front side than the barrel hold, to restrain over insertion of the rear end of the rear barrel into the cap.Type: GrantFiled: January 10, 2002Date of Patent: November 22, 2005Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Kazuhiko Furukawa, Yojiro Sano
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Publication number: 20050232685Abstract: 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.Type: ApplicationFiled: May 13, 2003Publication date: October 20, 2005Applicant: Mitsubishi Pencil Kabushiki KaishaInventor: Takao Koyama
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Patent number: 6955491Abstract: A marking pen having an excellent cap-off performance which comprises at least a colorant, a solvent and a resin and, if necessary, an erasability-providing agent as ink components and 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 the above coating agent comprises petroleum waxes comprising hydrocarbons having side chains as a principal component (50% by weight or more). Preferably, the above petroleum waxes comprising hydrocarbons having side chains as a principal component have a melting point of 63° C. or lower and are solid at room temperature.Type: GrantFiled: December 21, 2001Date of Patent: October 18, 2005Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Takahiro Osada, Suguru Yazawa
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Patent number: 6953502Abstract: Provided are a navy blue water based ink composition for a ballpoint pen comprising a colorant, water and a dispersant, wherein at least cobalt phthalocyanine blue is used as the colorant, and a pH of the ink falls in a range of 7 to 10, and a ballpoint pen occulding the water based ink composition. Cobalt phthalocyanine blue has preferably a diameter of 500 nm or more and a content of 0.05 to 30% by weight based on the total amount of the ink composition.Type: GrantFiled: June 27, 2001Date of Patent: October 11, 2005Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Hideyuki Ikoma
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Patent number: 6905521Abstract: Disclosed are a cumulative hair-dyeing temporary hairdye comprising 0.01 to 3% by weight of an acid dye as a colorant, 0.1 to 10% by weight of a nonionic or anionic silicone base resin, 3 to 20% by weight of a hair-dyeing aid, 30 to 80% by weight of a lower alcohol and 5 to 50% by-weight of water and having a pH of 2 to 5 and a viscosity of 100 mPa·s or less and a production process for a cumulative hair-dyeing temporary hairdye, wherein the respective components are blended in such an order that at least a nonionic or anionic silicone base resin and a lower alcohol are mixed to prepare a vehicle, and then the other components are blended therewith and stirred.Type: GrantFiled: December 15, 2000Date of Patent: June 14, 2005Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Eiji Tsuchiya
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Publication number: 20050079001Abstract: 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.Type: ApplicationFiled: January 30, 2003Publication date: April 14, 2005Applicant: mitsubishi pencil kabushiki kaishaInventors: Kazuhiko Furukawa, Kiyoshi Fujisawa
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Publication number: 20050074273Abstract: Provided is 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.Type: ApplicationFiled: December 27, 2002Publication date: April 7, 2005Applicant: Mitsubishi Pencil Kabushiki KaishaInventors: Masaru Miyamoto, Yoji Takeuchi
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Patent number: 6857807Abstract: A liquid applicator having a predetermined applying part (3) at the front end of a cylindrical main part (2), wherein a liquid squeezing mechanism (4) attached to the main part (2) is caused to push an application liquid (L) having a viscosity of 30 mPa·s to 500 mPa·s stored in the main part (2), forwards so as to feed applying part (3), is constructed so that an application liquid feeder (3c) also serving as a liquid leakage preventing structure is arranged between the applying part (3) and the main part (2).Type: GrantFiled: June 14, 2001Date of Patent: February 22, 2005Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Tetsuaki Akaishi
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Patent number: 6786958Abstract: Provided is an oil based ink for a ball-point pen comprising at least an alcohol-soluble dye, carbon black, a resin and an organic solvent, wherein the carbon black described above has a DBP oil absorption of 80 cc/100 g or less. The carbon black has preferably a particle diameter of 30 m&mgr; or less and a content of 1 to 15 mass % based on the total amount of the ink.Type: GrantFiled: September 6, 2002Date of Patent: September 7, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Masaaki Morita, Susumu Suzuki, Toshiaki Takayanagi, Kyoko Kobayashi
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Patent number: 6776829Abstract: Provided is a water based ink composition for a writing instrument comprising at least one of nonionic surfactants comprising polyhydric alcohol fatty acid esters, ethylene oxide adducts of polyhydric alcohol fatty acid esters, ethylene oxide adducts of higher alcohols and alkylphenols, ethylene oxide and propylene oxide adducts of higher alcohols, ethylene oxide adducts of castor oil or hardened castor oil, ethylene oxide adducts of hardened castor oil fatty acid esters and ethylene oxide adducts of higher alkylamines and fatty acid amides and further comprising a colorant, a perfume and water. It is less liable to cause feathering of the lines and has durability of fragrance, in which a perfume is dispersed and retained in an aqueous medium in a stable state.Type: GrantFiled: December 2, 2002Date of Patent: August 17, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Masaru Miyamoto, Tadashi Kamagata, Yoji Takeuchi, Shigeru Miyazaki
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Patent number: 6769827Abstract: In a free-ink type collector writing instrument, a collector (5) is formed with a passage hole (10) for providing commutation between the interior and the outside air so as to prevent the point assembly from being affected by the variation in inner pressure upon freezing or upon increase or decrease in pressure. At the same time, the passage hole is constructed in a shape so as not to present a stronger capillary attraction than that of an air/liquid exchanger (9) and than that of an ink feeder portion (3,6), whereby the problem of exudation leakage over time can be prevented.Type: GrantFiled: November 13, 2002Date of Patent: August 3, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Kazuhiko Furukawa, Yojiro Sano
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Patent number: 6770688Abstract: A water based ink composition for a ballpoint pen which is comprises an alkali-swelling associative thickener comprising a polymer having a carboxyl group and a hydrophobic group, a pigment, a polar solvent containing water, a pH controlling agent and other additives. It is a water based ink composition which is stable over a long period of time without settling of the pigment itself and can be filled into a ballpoint pen having simplified ink free type structure as is the case with a ballpoint pen using an oil based ink.Type: GrantFiled: April 29, 1999Date of Patent: August 3, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Masaru Miyamoto
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Patent number: 6761496Abstract: A writing instrument equipped with an exchangeable inner pen filled with an ink containing a solvent having a vapor pressure of 1 to 50 mm Hg (20° C.) in a writing instrument main body which is a barrel part, wherein the inner pen described above has a pen tip comprising a fiber feeder or a plastic feeder, and the above pen tip is coated with a substance having a vaporization-inhibiting action in an amount of 0.01 to 20% by weight in terms of a weight ratio based on the pen tip. It is more effective to further add a substance having a vaporization-inhibiting action to the ink. The substance having a vaporization-inhibiting action includes glycerin derivatives, polyoxyethylenesorbit fatty acid esters, alkyl phosphates, waxes and lecithin.Type: GrantFiled: December 4, 2002Date of Patent: July 13, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Takahiro Osada, Kazuhiro Ami, Yukinori Sawa
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Publication number: 20040126646Abstract: 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.Type: ApplicationFiled: July 23, 2003Publication date: July 1, 2004Applicant: Mitsubishi Pencil Kabushiki KaishaInventors: Yoshihisa Suda, Takahiro Osada, Kunitaka Yamada
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Patent number: 6746524Abstract: Disclosed is a process for producing a sintered color pencil lead characterized by pigmenting a white or light-colored porous sintered pencil lead with an organic pigment by treating said porous sintered pencil lead with a solution of at least one compound of the following Formula (I) to be filled with said compound and then by forming said organic pigment within the pores by means of heating, A(B)x in which x is an integer from 1 to 8, A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo series, phthalocyanine or diketopyrrolopyrrole which is attached to x groups B via one or more heteroatoms selected from the group consisting of N, O and S and forming part of the radical A, B is hydrogen or a group of the formula where at least one group B is not hydrogen and, if x is 2 to 8, all the groups B can be identical or different, and L is any suitable solubilizing group.Type: GrantFiled: November 28, 2001Date of Patent: June 8, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Katsunori Kitazawa
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Patent number: 6734233Abstract: A solid adhesive composition which has an excellent applying performance even after an applying part of the solid adhesive is left to stand in the atmosphere for a long time and which is excellent in a cap-off performance and which comprises at least an adhesive component, a gelling agent and a solvent, wherein contained in the above composition are at least one selected from the group consisting of waxes such as paraffin waxes and olefin waxes which are a solid at room temperature and have a solubility of 20% or less in the solvent at room temperature and/or a substance absorbing moisture contained at least in the atmosphere and/or the adhesive composition to form an evaporation-inhibiting film.Type: GrantFiled: June 24, 2002Date of Patent: May 11, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventors: Suguru Yazawa, Takahiro Osada
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Patent number: 6709501Abstract: Provided is a baked color pencil lead which comprises a baked lead obtained by impregnating pores of a porous baked lead comprising at least a filler with a solution containing a polysiloxane having a structural unit represented by the following Formula (I) and subjecting it to heat treatment in an oxidation atmosphere and/or a non-oxidation atmosphere and a colorant filled into the pores of the resultant baked lead and which is excellent in mechanical strength (bending strength, tensile strength, impact strength and the like) while exhibiting a satisfactory coloring power and sufficient drawn line density: wherein R1 and R2 each represent an alkyl group, an alkoxy group, a hydroxy group or a siloxane group, and they may be the same or different.Type: GrantFiled: May 24, 2002Date of Patent: March 23, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Atsushi Satoh
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Patent number: 6702498Abstract: A writing implement having a feeder core for feeding ink in an ink tank to a pen tip and an ink collector in which a plurality of comb-tooth like elements formed with an air-liquid exchange groove are arranged at intervals in a feeder core axial direction. An ink holding plate is provided so as to face a rear end face of the ink collector in such a manner as to form a gap for holding the ink in the ink tank by way of the capillary phenomenon between the ink holding plate an the rear end face. A plurality of air exchange grooves in which ink flows and is discharged in an amount responding to a change in pressure in the ink tank into and from grooves between the comb-tooth like elements which are formed between an outer edge portion of the comb-tooth like element and a feeder core contact.Type: GrantFiled: May 28, 2002Date of Patent: March 9, 2004Assignee: Mitsubishi Pencil Kabushiki KaishaInventor: Yoshiomi Konose
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Patent number: 6676638Abstract: 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.Type: GrantFiled: February 8, 2001Date of Patent: January 13, 2004Assignees: Mitsubishi Pencil Kabushiki Kaisha, Nipro CorporationInventors: Hiroshi Takagi, Kentaro Takemae, Kunihiko Tanaka
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Publication number: 20040005185Abstract: 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.Type: ApplicationFiled: July 3, 2003Publication date: January 8, 2004Applicant: Mitsubishi Pencil Kabushiki KaishaInventor: Mitsuru Endo