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A patent classification is fixed under an agreement among people, otherwise it is useless. The International Patent Classification (IPC) is agreed internationally. The United States Patent Classification (USPC) is fixed by the United States Patent And Trademark Office . The European Classification (ECLA) is based on the IPC but adapted by the European Patent Office to its own requirements. The Derwent Classification System is fixed by an enterprise. PARADOXICAL NATURE Patent classifications have a paradoxical nature, because they are requested to work well for classifying newly published documents disclosing inventions that are by nature novel, despite they are formed through organizing existent documents disclosing existent inventions. Inventing a complete patent classification that will remain useful for next 100 years is equivalent to inventing all inventions that will become available in next 100 years, which is apparently impossible. This nature results in considerable amount of misclassified documents and frequent revision of classification system. SEE ALSO EXTERNAL LINKS |
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