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country

56

Country is represented by a standard 2-character code based on WIPO ST.3.

doc-number

56

doc-number is generally provided in DocDB-normalized format. An exception to this is made for WO documents, where the doc-number is normalized to YYYYnnnnnn. 
Patent document numbering is a complex subject, as the examples below illustrate:

For a complete discussion of document numbers over time and over multiple authorities, see: Number format concordance - publication numbers at 
https://www.epo.org/searching-for-patents/helpful-resources/data/tables/regular.html.

kind

56Kind

codeThe kind code is used to designate the publication stage of the document, including whether it is a published application or a granted patent. See ST.16.