Product News

New PNK field allows more precise crossover among STN patent databases

December  1st,   2010

To provide more precise patent publication number crossovers, STN has introduced the PNK (Patent Number/Kind Code) field for use when transferring patent publication numbers between databases. PNK field crossovers can be used to transfer publication numbers of published applications and granted patents. A new PNK.B (Patent Number/Kind Code of the Basic Patent) field also has been implemented in CASM/CAplusSM and is expected to be implemented soon in the Derwent World Patents Index (DWPISM) and in the INPAFAMDB/INPADOCDB family of databases.

PNK has also been added to these databases:


PNK is available for SEARCH, DISPLAY, SELECT, and ANALYZE. (In the DWPI and INPADOCDB/INPAFAMDB databases, however, PNK displays will be the same as PN displays.)

The PNK field is necessary because some patent-granting authorities use the same numbering schemes for both patent applications and granted patents, or for both patents and utility models. This causes searching difficulties for customers crossing over patent publication numbers, particularly when Japanese, Chinese, and Taiwanese patents were involved.

When you need to transfer patent publication numbers from one database to another, the PNK field will enable you to transfer them precisely. Just use TRANSFER PNK rather than TRANSFER PN to achieve better quality results. 


When you transfer Chinese granted patent number CN 1222622 on biotechnology from HCAplus to DWPI without its kind code C, you will retrieve a Chinese application with the same number, but with a totally irrelevant subject--door locks.

But when you transfer using the new PNK field that includes the kind code, you will maintain precision in your retrievals.

About CAS

Chemical Abstracts Service (CAS), a division of the American Chemical Society, is the world's authority for chemical information and related solutions. Dedicated to the ACS vision of improving people's lives through the transforming power of chemistry, the CAS team of highly trained scientists finds, collects and organizes all publicly disclosed substance information, creating the world's most valuable collection of content that is vital to innovation worldwide. Scientific researchers and patent professionals around the world rely on a suite of research solutions from CAS that enable discovery and facilitate workflows.

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