Lead of pencil

阅读:865发布:2021-02-24

专利汇可以提供Lead of pencil专利检索,专利查询,专利分析的服务。并且PURPOSE: A lead of a pencil having improved density, writing touch, and strength, prepared by vapor-plase plating of the periphery with carbon or graphite.
CONSTITUTION: A carbon or graphite film is formed on the periphery of a lead consisting mainly of (A) graphite and clay or carbon or (B) carbon black and wax by ion or chemical vapor-phase plating. The ion plating is carried out by ionizing vaporized particles, e.g. graphite or carbon black, with glow discharge, and by depositing the ionized particles accelerted with a d.c. high voltage applied on the negative pole lead firmly. The chemical vapor deposition is carried out by depositing carbon or graphite on the periphery of the lead heated at a high temperature according to the decomposition and polymerization of a hydrocarbon, e.g. acetylene or propane, in its atmosphere.
COPYRIGHT: (C)1980,JPO&Japio,下面是Lead of pencil专利的具体信息内容。

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