Derwent Class Codes

Derwent categorizes patent documents using a simple classification system for all technologies. This unique classification is consistently applied to all patents by Derwent's subject experts, enabling effective and precise searching in a particular area of technology.

Patents are divided into the following three broad areas in the database.

Chemical Sections (A - M)
Engineering Sections (P - Q)
Electrical and Electronic Sections (S - X)

They are subsequently divided into 20 broad subject areas or sections. These are designated A-M (Chemical), P-Q (Engineering), and S-X (Electrical and Electronic). More

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