Patents -- Classification

International patent classification.

World Intellectual Property Organization

Amended form of the annex to the European convention on the international classification of patents for invention.: Entered into force on 16th December 1961.

Council of Europe

European convention on the international classification of patents for invention, Paris, December 19, 1954.

Council of Europe

International patent classification.

World Intellectual Property Organization

International patent classification, 1974.

World Intellectual Property Organization

Strasbourg agreement concerning the international patent classification of March 24, 1971.

World Intellectual Property Organization

Development and use of patent classification systems.

United States. Patent Office

Classification key of patents for inventions: list of headings arranged alphabetically 1953.

Pakistan. Patent Office.

Międzynarodowa klasyfikacja patentowa: VI edycja

[opracowanie UP RP].

Manual of patent classification: (Gruppeneinteilung der Patentklassen)

Compiled by the Patent Office of the German Federal Republic (Deutsches Patentamt) 7th ed. Translated from German [by D. Ben Yaakov, and others] Terminology revised and translation fully edited by Peter J. Coffin.