Main Classification File

This is a harmonized list of patent classifications on all levels of resolution using the data we had available. USPTO patents in the Dataverse databases had US Patent Classifications (USPCs), while EPO and PCT had International Patent Classifications (IPCs) and Cooperative Patent Classifications (CPCs). The concordance between the two classification systems is provided in another file. 3 columns, 79.6M lines, "|" delimited; the columns are:--Pub_number: the patent publication number.--class: the patent classification number.--class_type: the type of classification this represents. "u" indicates USPC, "i" indicates IPC, "c" indicates CPC, "m" indicates an inferred IPC from the USPC-to-IPC concordance (described below), and "w" indicates the WIPO field.

本数据集基于现有可用数据构建，为覆盖全分辨率层级的统一化专利分类列表。Dataverse数据库中的美国专利与商标局（USPTO）专利采用美国专利分类（US Patent Classifications, USPC）；欧洲专利局（EPO）与专利合作条约（PCT）专利则同时采用国际专利分类（International Patent Classifications, IPC）与合作专利分类（Cooperative Patent Classifications, CPC）。两类分类系统的对应关系已在另一文件中给出。该数据集共3列、7960万行，以竖线（|）作为分隔符，各列说明如下：
--Pub_number：专利公开编号。
--class：专利分类编号。
--class_type：表示该分类的类型，其中"u"代表美国专利分类（USPC），"i"代表国际专利分类（IPC），"c"代表合作专利分类（CPC），"m"代表基于美国专利分类与国际专利分类对应关系推导得到的国际专利分类（详见下文），"w"代表世界知识产权组织（WIPO）分类领域。