Assignee: Mitsubishi Pencil Co., Ltd.

Location: Tokyo, JP
No. of patents: 115

Number	Title	Issue Date
8163556	Method of cell culture observation, carbon substrate for cell culture observation, and method for manufacture thereof The invention provides a substrate suitable for cell culture observation and a method of observation using the same. Crystalline carbon such as a graphite powder is mixed into a thermosetting resin such as a furan resin, and the mixture is molded in the shape of a s...	04/24/2012
8142091	Writing implement A writing implement capable of eliminating troubles associated with the adoption of a grip member having an end surface inclined from a vertical surface perpendicular to a central axis of a shaft tube. The inclination angle α of a step-facing surface 5A of t...	03/27/2012
8043686	Method of moulding composite member, and composite member A method of moulding a composite member and a composite member are provided in which a convex part can be formed at one member by moulding the other member integrally to the one member. A concave part 10a is provided at least at a part inside a metal m...	10/25/2011
7938592	Writing implement A refill of a low viscosity water-based ink ballpoint pen is provided with a housing, a pen tip attached to a front end of the housing, an ink tank (4) formed inside the housing, an ink guide member guiding ink in the ink tank (4) to the pen tip, and a...	05/10/2011
7909901	Liquid cartridge A liquid cartridge includes a vessel body for containing liquid. The vessel body includes a plurality of surfaces. An oxygen outlet is provided on one surface among the plurality of surfaces of the vessel body. And an oxygen input is provided on a surface other than...	03/22/2011
7850381	Mechanical pencil A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable together in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that first and...	12/14/2010
7850380	Mechanical pencil A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1). By axial movement of the rotor in conjunction with writing operation, the rotor rotates ...	12/14/2010
7815385	Mechanical pencil A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6	10/19/2010
7806615	Mechanical pencil A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that first and second c...	10/05/2010
7802936	Mechanical pencil A chuck (4) for grasping a writing lead and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1). A rotational drive mechanism for the writing lead is formed such that first and second c...	09/28/2010
7794533	Oil-based ink composition for writing utensil and writing utensil employing the same The present invention provides an ink composition containing an olefinic wax dispersion added so as to impart smooth writing properties without causing starving at the starting of writing, and the ink composition has noticeably improved stability over time. The pres...	09/14/2010
7687178	Fuel container A liquid fuel is contained in a fuel container, and the liquid fuel is discharged from a fuel outlet. Further, a water is contained in a water containing pipe provided in the fuel container, and the water is discharged from a water outlet to the outside. Air taken i...	03/30/2010
7654763	Mechanical pencil A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6	02/02/2010
7641412	Ball-point pen A ball-point pen, wherein a cover member (6) is fitted to a joint member (3) connecting a writing tip (1) rotatably supporting a writing ball (2) at the tip thereof to an ink storage tube. When the cover member (6) is fitted to the...	01/05/2010
D602528	Pen	10/20/2009
D597135	Pen	07/28/2009
D592246	Pen	05/12/2009
7521491	Oil-based ink composition for ballpoint pen and ball-point pen using oil-based ink An oil-based ink composition for a ball-point pen that enables suppression of a blobbing phenomenon by controlling the internal cohesion force of an ink is provided; An oil-based ink composition for a ball-point pen at least comprising a colorant, a resin, and from ...	04/21/2009
7503939	Hair color A hair color which includes 0.5 to 8% by weight of a basic dye as a coloring agent, 0.5 to 15% by weight of a alcohol-soluble resin, 20 to 80% by weight of lower alcohol and 5 to 50% by weight of water. The hair color does not require washing of the hair immediately...	03/17/2009
D586393	Pen	02/10/2009
7473309	Water-based ink composition and ballpoint pen using the same Provided are a water-based ink composition characterized by containing 0.01 to 1.0% by weight of high molecular saccharides (trade name: Diutan gum) represented by Formula 1 as an essential component in the ink composition and a ballpoint pen in which an ink reservo...	01/06/2009
7462229	Oil-based ink composition for ballpoint pen using oil-based ink Oil-based ink composition for a ballpoint pen, involving at least a coloring material, a resin and a solvent selected from the group consisting of an alcohol, a polyhydric alcohol and a glycol ether each having a vapor pressure of 0.001 mmHg or more at 25° C. as a ...	12/09/2008
7452148	Lead holding structure of mechanical pencil A lead holding structure of a mechanical pencil where a predetermined lead holding force is maintained so that a lead does not move even if a writing pressure is repeatedly applied to the lead and where a so-called biting-off of a lead (break) is prevented without d...	11/18/2008
D578161	Pen	10/07/2008
D575819	Pen	08/26/2008
7417080	Oil-based ink composition and writing instrument using the same Provided is an oil-based ink composition comprising at least a colorant, titanium oxide, a solvent including propylene glycol monomethyl ether and ethanol, a polyvinylbutyral resin and a ketone resin. ...	08/26/2008
7405865	Liquid for electrophoretic display, display medium and display device using the same A medium for electrophoretic display using a liquid for electrophoretic display which can reversibly change a visible state by action of an electric field includes a medium comprising each independent structures of microcapsules or cells filled with a liquid for ele...	07/29/2008
7381754	Oil-based ink composition and uses thereof An ink composition comprising at least one dye represented by one of the following chemical structural formulae and an anthraquinone-based pigment as coloring materials, an alcohol or an ether as a solvent, and a resin. In a preferred embodiment, a triarylmethane-ba...	06/03/2008
D562894	Pen	02/26/2008
7332695	Carbon heating element and method of producing same A carbon heating element having an arbitrary specific resistance and an arbitrary shape which are arbitrary necessary as a heating element, and a method of producing the same. The carbon heating element is obtained by uniformly dispersing one or at least two metal o...	02/19/2008
D561835	Pen	02/12/2008
D558269	Pen	12/25/2007
7303350	Ink composition for pressurized ball-point pen and pressurized ball-point pen An ink composition for a pressurized ballpoint pen and a pressurized ballpoint pen which can exhibit excellent writing properties, do not cause ink leakage and which are suited to handwriting. The ink composition for a pressurized ballpoint pen includes at least a c...	12/04/2007
7294955	Electrode for electron gun and electron gun using same An electrode for an electron gun and an electron gun using same are provided which make use of stable carbon material having small work function and which permit orientation control to be achieved and which can be manufactured at a low cost. An electrode for an elec...	11/13/2007
7264756	Optical measurement substrate and fabrication method for the same The invention provides at a relatively low cost a carbon substrate that is formed from an opaque material and that has an extremely flat surface so that optical measurements can be made on the substrate. Graphite powder with a particle size of 10 μm or less is mixe...	09/04/2007
7201792	Water based ink composition for writing instrument Provided is a water-based ink composition for a writing instrument comprising at least a colorant and water, wherein a nonionic high molecular surfactant having an alkylene oxide chain as a hydrophilic group and having an average molecular weight of 3000 to 200,000 ...	04/10/2007
D540383	Pen	04/10/2007
7195365	Vehicle lamp Disclosed is a vehicle lamp that is designed to reliably remove snow, etc. adhering to a lens. A carbon-based heating element is mounted within a lamp body so that the heat rays radiated from the heating element irradiate a rear surface of the lens. ...	03/27/2007
7179006	Ink follower An ink follower which has stable followability regardless of a pen body specification, a flow rate for writing and a writing speed and does not cause back leaking of the ink originating in shortage in the ink follower in the middle of writing and scattering of the i...	02/20/2007
7172648	Oil-base ballpoint ink composition and oily ballpoint pens A ballpoint ink composition capable of preventing a blobbing phenomenon by controlling the volatility of the ink solvent to prevent extreme drying on the ball surface and control the internal cohesion of the ink is provided, which is an oil-based ballpoint ink compo...	02/06/2007

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Assignee: Mitsubishi Pencil Co., Ltd.