What is the core level and how was it defined?
(see also paragraphs 29 and 30 of the Guide to the IPC) The core level consists of a limited number of classification places. It comprises only hierarchically high entries and is therefore the relatively stable part of the IPC. The IPC down to the main group level is the foundation of the core level. Additional subgroups were added to this foundation. The selection criteria was the following: if no more than 5,000 documents belonging to the PCT Minimum Documentation are classified under an entry, most probably no more than 200 documents of a small or medium-sized patent office will be classified under that entry. The assumption is that if there are no more than 200 documents classified under a classification entry, the manual or the computer-search based upon the classification symbol(s) is at least feasible. The core level will be revised in three-year revision cycles. This “light and stable version” of the IPC is therefore best suited for small and medium patent offices.
(see also paragraphs 29 and 30 of the Guide to the IPC) The core level consists of a limited number of classification places. It comprises only hierarchically high entries and is therefore the relatively stable part of the IPC. The IPC down to the main group level is the foundation of the core level. Additional subgroups were added to this foundation. The selection criteria was the following: if no more than 5,000 documents belonging to the PCT Minimum Documentation are classified under an entry, most probably no more than 200 documents of a small or medium-sized patent office will be classified under that entry. The assumption is that if there are no more than 200 documents classified under a classification entry, the manual or the computer-search based upon the classification symbol(s) is at least feasible. The core level will be revised in three-year revision cycles. This “light and stable version” of the IPC is therefore best suited for small and medium patent offices. According to
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