File Name: WIPOapp_IPC_class

Observations: 4,669,915

Sorted by Unique Index: pub_no*for_IPC_index

Description: List of IPC classifications for each WIPO patent. Each classification has a separate record.

Variables

Variable	Type	Len	Columns in Ascii File	Description
Pub_No	Char	20	1-20	Publication Number
IPC_class	Char	14	21-34	IPC classification
IPC_reclass_date	Char	7	35-41	Year and Month (4-digit year+’.’+2-digit month) of IPC classification being used.
IPC_num	Num	8	42-49	Total number of IPC classifications for this patent
IPC_index	Num	8	50-57	Sort order of this IPC classification