The Derwent classification system is fixed by an enterprise.
Köppen climate classification | patent | United States Patent and Trademark Office | British undergraduate degree classification | British Board of Film Classification | United States patent law | Points classification in the Vuelta a España | Mountains classification in the Giro d'Italia | European Patent Organisation | Biological classification | Race (classification of human beings) | Patent Cooperation Treaty | European Patent Office | Dewey Decimal Classification | Bordeaux Wine Official Classification of 1855 | Stellar classification | patent medicine | Mathematics Subject Classification | Library of Congress Classification | Letters Patent | letters patent | Classification of discontinuities | United States Court of Customs and Patent Appeals | Race (human classification) | patent infringement | Patent | Office of Film and Literature Classification | Classification of Champagne vineyards | Young rider classification in the Tour de France | Settlement classification in Mexico |
At the request of David Kappos, the Director of the USPTO, PIUG and CEPIUG endorsed development of a joint patent classification system by the USPTO and European Patent Office.