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尽管IPC力图包括全部应用技术领域,并列有约6万条类目,人们在使用该表时仍有时找不到满意的类名,些时可考虑:①使用外延更广的上位类号扩检;②查找余类(或称为杂类);③查找意义相近的类目等办法。此外还应考虑其相关类目:①方法类与设备类,只标明设备的类目有可能包含相关的生产方法,反之亦然;②方法类与产品类;③功能类与应用类。
Although the IPC is trying to include all the fields of applied technology with about 60,000 categories in the list, people sometimes can not find a satisfactory class name when using the table. For some time, consider using the Extended Epitome ; ② find the remaining classes (or referred to as miscellaneous); ③ find meaning similar categories and other methods. In addition, it should also consider the relevant categories: ① methods and equipment category, only indicate the equipment category may contain related production methods, and vice versa; ② methods and products category; ③ functional categories and applications.