世界专利索引(WPI)及其文摘(WPA、CPI、EPI)经过英国德温特出版公司(DERWENTPUBLICATIONSLTD.)配套出版后,给检索带来了方便。但至今仍有不少读者并不十分了解,造成使用者甚少的奇怪局面。其实“索引”部分(目录周报),共“四种”分册[P(一般)、Q(机械)、R(电气)、CH(化工)],每种分册,每周出版一期,每期通过“四种”题录,与“文摘”部分(文摘周报)共十九种分册(WPA_1P_1～P_3,P_4～P_8;Q_1～Q_4,Q_5～Q_7;EPI;S～T,U～V,W～X; The World Patent Index (WPI) and its abstract (WPA, CPI, EPI) have been indexed by the publication of DERWENTPUBLICATIONSLTD. But so far there are still many readers do not fully understand, resulting in very few users strange situation. In fact, the “Index” section (Catalog Weekly) contains a total of four kinds of volumes [P (General), Q (Machinery), R (Electrical) and CH (Chemical) A total of 19 volumes (WPA_1P_1 ~ P_3, P_4 ~ P_8; Q_1 ~ Q_4, Q_5 ~ Q_7; EPI; S ~ T, U ~ V, W ~ X;