Country is represented by a standard 2-character code based on WIPO ST.3. In the case of WO publications, the country is the authority where the application was filed.
For a complete discussion of application numbers in DocDB over time and over multiple authorities, see Number format concordance - application numbers at
Kind code of applications comes from DocDB. Values include:
Note that some documents (utility models, reissued patents, etc.) contain non-standard kind codes used by various patent-granting authorities. See the Kind Code Concordance List for a list of many of the kind codes corresponding to the different publication stages of a patent application.
Date of filing (YYYYMMDD)
Original language of filing, 2-character code based on ISO 639-2.