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| Number | Title | Issue Date |
| 7803220 | Color lead for a writing device, drawing device or painting device An unburnt color lead for writing devices, drawing devices and painting devices, includes at least one coloring material, at least one binder, at least one organic lubricant which is solid at room temperature, and at least one filler material whose particles essenti... | 09/28/2010 |
| 7291210 | Solid drawing material and method for producing the same Disclosed herein is a first solid drawing material comprising water, a coloring agent, a solidifying agent that is a fatty acid alkali metal salt, and an O/W type emulsion of a separating agent that is an oily material which hardly volatilizes at room temperature. T... | 11/06/2007 |
| 7217378 | Simple and efficient process for the preparation of pencil lead from spent pot-liners The present invention relates to a simple and efficient process for the preparation of pencil lead from the spent or waste pot liners of aluminum industries, said process comprising steps of crushing the liners into small sizes, adding chromic acid to the crushed li... | 05/15/2007 |
| 6875261 | Unburned color pencil lead For the improvement of moldability of a lead and bending strength of a lead, a non-calcined lead of a colored pencil contains a colorant, a binder, a body filler, waxes and/or oils, and a hydrophilic surfactant, and as a hydrophilic surfactant, a polyethylene additi... | 04/05/2005 |
| 6830610 | Method for increasing the tensile, breaking and flexural strength of colored leads and colored pencils containing the same A method for increasing the tensile, breaking and flexural strength of coloured leads. The method is characterized in that 1 to 50 percent by weight alkyl and/or hydroxyalkyl cellulose which are soluble in organic solvents and whose alkyl radicals can be straight-ch... | 12/14/2004 |
| 6746524 | Process for producing sintered color pencil lead 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 fo... | 06/08/2004 |
| 6709501 | Baked color pencil lead and process for producing the same 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 subj... | 03/23/2004 |
| 6645279 | Baked colored pencil lead and process for producing the same A process for producing a baked color pencil lead, comprising dipping a white or pale color porous baked lead having a volume-based median pore diameter of 0.27 μm or less in a dye ink and then applying a pressure of 1.5 MPa or more thereto to impregnate... | 11/11/2003 |
| 6511533 | Non-calcined lead of a colored pencil A non-calcined lead of a colored pencil obtainable by following process: a binder or its solution are added to a mixture comprising a colorant, a body filler, and a solvent as required, and the resultant mixed compound is kneaded, after that, the said solvent ... | 01/28/2003 |
| 6395076 | Non-calcined lead of a colored pencil A non-calcined lead of a colored pencil obtainable by following process: a binder or its solution are added to a mixture comprising a colorant, a body filler, and a solvent as required, and the resultant mixed compound is kneaded, after that, the said solvent ... | 05/28/2002 |
| 6277182 | Pigment-containing oil-based gel materials A pigment-containing oil-based gel material which contains 0.1 to 25% by weight of a hydroxy-fatty acid having 10 to 20 C atoms, 0.1 to 30% by weight of C30-45 -alkylmethicone, 1 to 70% by weight of an oil component and 0.1 to 50% by weight of ... | 08/21/2001 |
| 6210471 | Marking composition and method for marking dark substrates A marking composition suitable for marking colored substrates, especially dark substrates, is disclosed. The marking composition comprises a wax, a fatty acid, a reflecting filler, and a colorant selected from an oil soluble dye, an oil dispersable dye, o... | 04/03/2001 |
| 6136078 | Marking composition and method for marking dark substrates A marking composition suitable for marking colored substrates, especially dark substrates, is disclosed. The marking composition comprises a wax, a fatty acid, a reflecting filler, and a colorant selected from an oil soluble dye, an oil dispersable dye, o... | 10/24/2000 |
| 6056810 | Colored lead pencil The invention relates to a colored pencil lead having an essentially water-free base material that is at least partially water-soluble or can be suspended in water, which base material contains at least one dye and at least one reactant present in a solid... | 05/02/2000 |
| 5911814 | Baked color pencil lead and process for producing the same A baked color pencil lead prepared by impregnating pores of a white or light-colored porous baked lead with a dye solution prepared by dissolving a dye in a mixed solvent of polyoxyethylene alkyl ether represented by the following Formula (1) and a low bo... | 06/15/1999 |
| 5716434 | Non-erasable pencil lead Provided is a non-erasable pencil lead for a natural pencil and a mechanical pencil, characterized in that the pores of a baked pencil lead are impregnated with an unsaturated compound containing an unsaturated group having an iodine value of at least 130... | 02/10/1998 |
| 5645629 | Calcined pencil leads and method of manufacturing the same There are herein disclosed calcined pencil leads which have a high strength, excellent light resistance and weathering resistance as well as a sharp color and which can easily be erased by an eraser, and a method of manufacturing the calcined pencil leads... | 07/08/1997 |
| 5595589 | Baked color pencil lead and method of manufacturing the same A baked color pencil lead which can draw lines showing a vivid color and having excellent light fastness while holding excellent physical strength, and which is manufactured by a method comprising the steps of: kneading a blend composition comprising at least ... | 01/21/1997 |
| 5346540 | Colored lead A colored lead composed of a basic substance of one or a plurality of fatty acids, an emulsifier and a binder includes metal and mica powder in order to produce a metallic and glossy effect.... | 09/13/1994 |
| 5318622 | Non-baked color pencil leads and method for preparing same Novel non-baked color pencil leads are here disclosed which can be obtained by forming a blend composition from a filler, a pigment, a binder and the like without using any wax, at least one of the pigment and the filler being all or partially covered wit... | 06/07/1994 |
| 5118345 | Composition for the preparation of pencil lead A method and composition are disclosed for the preparation of pencil lead from clay, graphite and optionally other material, wherein the clay or the clay/graphite mixture is digested with water, pressed, dried and fired, and at least one alkali phosphate,... | 06/02/1992 |
| 5075054 | Method for the preparation of pencil lead A method and composition are disclosed for the preparation of pencil lead from clay, graphite and optionally other material, wherein the clay or the clay/graphite mixture is digested with water, pressed, dried and fired, and at least one alkali phosphate,... | 12/24/1991 |
| 4853167 | Method for making lead pencils and colored pencils A method for making pencil leads without firing includes taking mixtures of graphite and MgO which are made of Mg salts with MgCl2 solutions, forming such mixtures into desired shapes (crayons or pencil leads) and hardening them at room tempera... | 08/01/1989 |
| 4758540 | Method for the production of pencil leads and pencil leads produced by the method The invention is concerned with the production of pencil leads and also pencil leads as produced by the proposed method. In accordance with the invention, graphite, enamel frit and quartz flour, preferably at least approximately in a ratio of one part of ... | 07/19/1988 |
| 4689403 | Disazo pigment from condensation of carboxylic acid chloride with 2,5-dichloro-1,4-phenylene diamine The present invention concerns the disazo pigment of the formula ##STR1## The new pigment is useful for coloring plastic material in pure red shades of high tinctorial strength and outstanding fastness to light and migration.... | 08/25/1987 |
| 4668572 | Pencil lead composition with magnesium oxysulfate fibrous material A pencil lead comprising a binder, a filler and a colorant as essential components, said filler consisting at least partially of a fibrous material of magnesium oxysulfate. This pencil lead has a high bending strength and a stable quality which does not d... | 05/26/1987 |
| 4371632 | Compositions, processes, and writing elements employing resins of the thermosetting type A "cold-processed" thermoset plastic pencil lead is produced by extruding a composition formed by blending a mixture of a marking material, a phenolic novolac resin, a hardening agent, a plasticizer, and a lubricant. Blending, billeting, and extruding ope... | 02/01/1983 |
| 4298507 | Flexible marking composition for pencils A flexible marking composition for a pencil. The composition comprises an elastomer, one or more plasticizers, a selected pigment, and a pigment carrier mixed together in specified proportion and vulcanized with a vulcanizing agent.... | 11/03/1981 |
| 4030934 | Coloring composition for line- or pattern- drawing elements A coloring composition for line- or pattern-drawing elements which comprises as a base material thereof one or more acidic sublimating substances such as benzoic acid, salicylic acid and phthalic acid. Lines and/or patterns drawn with the coloring composi... | 06/21/1977 |
| 4017451 | Pencil lead and manufacturing method of the same A pencil lead comprises an extrudate of a kneaded blend of a coloring material and a novolak resin or a derivative thereof.... | 04/12/1977 |
| 3976488 | Treating agent for diazo-type multicolor reproduction An original-treating agent to be used in the process for the diazo-type multi-color reproduction by which portions of a sensitive paper corresponding to preselected portions of an original can be colored selectively in different hues.... | 08/24/1976 |
