Abstract
Abstract To clarify the rules for IPC classification the Japanese Patent Office has issued a Working Standard for assigning IPCs to Patents the contents of which are briefly described in the article. In some selected groups the Japanese Patent Office uses a subdivision of the IPC so called ‘Developing Marks’ — in others a special classification is done parallel to and based on another viewpoint than the IPC — so called ‘Facet Classification Marks’. Finally some proposals of Japan for the Int. Cl.4 are mentioned.
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