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xiv <strong>Patent</strong>s and Designs Journal No. 5940 26 March 2003<br />

Notices - cont<br />

Classification Information<br />

Classification Key<br />

The UK Classification Key is currently used to classify and, where appropriate, to index all<br />

published UK specifications.<br />

In addition selected published <strong>European</strong> (EP), <strong>Patent</strong> Cooperation Treaty (PCT) applications<br />

and US specifications have, in the past, been classified. Details of classification of non-UK<br />

documents on the UK Key are given at the end of this notice.<br />

The Classification Key sets out the <strong>Patent</strong> <strong>Office</strong>’s system of classification by means of over<br />

400 headings with detailed sub-classifying and indexing by coded terms within the<br />

headings. There are altogether about 78000 of these terms. The headings are arranged to<br />

form 40 divisions. One or more divisions are published as Units of the Classification Key, as<br />

shown below, at £12.50 per unit. The cost of a complete key is £300.<br />

Unit Div<br />

1 A1-3<br />

2 A4<br />

3 A5-6<br />

4 B1-2<br />

5 B3<br />

Unit Div<br />

6 B4-5<br />

7 B6<br />

8 B7<br />

9 B8<br />

10 C1<br />

Unit Div<br />

11 C2<br />

12 C3<br />

13 C4-5<br />

14 C6-7<br />

15 D1-2<br />

Unit Div<br />

16 E1-2<br />

17 F1<br />

18 F2<br />

19 F3-4<br />

20 G1<br />

Unit Div<br />

21 G2-3<br />

22 G4-6<br />

23 H1<br />

24 H2<br />

25 H3-5<br />

One further heading, U1S, falling outside the divisional structure, is provided for indexing<br />

significant uses, applications and utilities disclosed in connection with inventions classified<br />

in one or more of the above headings.<br />

In addition, the divisional structure above includes three headings used purely for indexing<br />

purposes, viz heading C6Y, Indexing Schedule for micro-organism information (used for<br />

recording new micro-organisms, and micro-organisms used in chemical, biochemical or<br />

microbiological processes), heading C3W, Indexing Schedule for polymer information (used<br />

for recording polymer information in documents classified in certain other C3 headings) and<br />

H3T, Indexing Schedule for amplifiers, oscillators, pulse logic and switching circuits (used in<br />

headings H3F, H3P or H3W).<br />

Three free pamphlets, which are supplied to each purchaser of one or more key units are<br />

available, namely:<br />

1. “Structure of the Classification Key”, listing the headings grouped under each of the 40<br />

divisions.<br />

2. “Notes on the Use of the Classification Key”<br />

3. “Heading U1S Universal Indexing Schedules for use, Application, Utility and Property”<br />

A “Concordance between the UK Key and the IPC” and a “Documentation Records”<br />

pamphlet are also available. These are supplied free of charge to each purchaser of a<br />

complete Key or can be purchased separately at a cost of £8 per copy.<br />

The Key is revised at intervals to incorporate changes in classification. Previously each<br />

edition related to a range of 50000 specifications or less. Now each edition is related to<br />

calendar dates.

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