IPC and NACE classification of patents. A comparison between data on U.S. and on French, German and U.K. patents

Hermann Kronz, Hans Grevink and Hans Grevink

World Patent Information, 1980, vol. 2, issue 3, 103-115

Abstract: This article is a review of the principal results of a statistical study of the US-patented applications filed during the period 1969 to 1974. The study itself will be published as EUR-Report No 6575. The US data are classified according to the IPC and are compared with those of the Federal Republic of Germany, France and the United Kingdom, with regard to their quantitative distribution over selected technological classes. Further, the technological trends within selected classes are highlighted. An attempt has also been made to link the patent statistical data to the industrial branches classified according to the NACE.

Date: 1980
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