The paper introduces the changes of the 7 th edition of International Patent Classification,including the number of classification entries,the number of indexing code entries and its basic structure.The relations of i...The paper introduces the changes of the 7 th edition of International Patent Classification,including the number of classification entries,the number of indexing code entries and its basic structure.The relations of its changes to human technical inventions are also discussed.展开更多
文摘The paper introduces the changes of the 7 th edition of International Patent Classification,including the number of classification entries,the number of indexing code entries and its basic structure.The relations of its changes to human technical inventions are also discussed.
