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PB Quality Standards for National and International Patent Classification

From: Canadian Intellectual Property Office

The following standards ensure that the application of Classification codes:

Assignment of IPC

Patent documents are classified consistently, according to the rules stated in the Guide to the IPC, notably Articles 39-41, 45, 67-75, 77-80, 90-101, 103, 105, 118-123, 127-131, 133, 141-143, 147-156 and CIPO’s internal precedence rules for the First IPC symbol.


Review of IPC symbols is conducted upon receipt of the corresponding task from examination and giving due consideration to the suggestions presented. Upon completion of the task and the assignment of new codes as appropriate, the task is reassigned to proper examination queue.


When necessary, the rationale for classification symbols is clearly explained in notes, particularly:


Patent classification is carried out according to the priority order, and within the established time frames.

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