Welcome to the new version of the Patents Manual. Please note there are changes to the numbering and sequence of the chapters and pages in the manual. You are encouraged to take the time to explore and familiarise yourself with this new structure. Classification using C-sets

Date Published

The rules of C-Sets are specific for each technical field. C-Sets may also be referred to as ‘combination sets’ or ‘combination classes’ or the explanation may just mention that the classification is to be done as a combination of symbols.

The definition statement for a subclass may indicate areas in the subset in which C-Sets can or must be used, but specific information about how to create a C-Set in a particular technical area can usually be found in the definition or notes for the relevant sub-group or group (e.g. C12N 15/10).

To ensure classification accuracy and consistency, C-Sets classification is authorised only in a limited number of CPC subclasses. The Table in Annex III of the CPC Guide lists those subclasses authorised for C-Sets allocation. As shown in the Table, not all groups within the authorized subclasses are allowed for C-Sets allocation.

Example: In subclass C07C it is not allowed to allocate a C-Set with a base symbol in group C07C9/00. It is also not allowed to allocate a C-Set with a subsequent symbol in group C07C1/00.

Amended Reasons

Amended Reason Date Amended
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