Two issues with IPCs
First of all a new group of IPC code arised:
G01Q
we have 73195 in all patstat, but still we have no reclassification (OST30 or NACE) for them
See as example: EP 2250533
Soon we will try to suggest a possible cathegory for this IPC.
On the other hand we must highlight some IPC, falling under ipc_class_level 'S' are present in sept. 2009 data aside Advanced and Core IPCs. EPO suggestion is to drop them (they are about 1.2 Millions)
'A', 160.067.275
'C', 140.155.212
'S', 1.294.288
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