The ECLA classification system

David T. Dickens

World Patent Information, 1994, vol. 16, issue 1, 28-32

Abstract: There are many difficulties with online searching using the International Patent Classification Codes (IPC) and relying on them for a subject search can often result in incomplete searches. The European Classification system (ECLA) is the classification system of the European Patent Office (EPO) which is used to classify their internal search documentation. Although the ECLA classification is used internally by the EPO, it is available and searchable on a number of patent databases on Questel. While the ECLA codes are based on the IPC system, they are more specific and overcome many of the IPC's weaknesses, and can be used to increase recall in subject searches.

Date: 1994
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