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country

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.

doc-number

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doc-number is provided in both DocDB-normalized format and in the format provided by the publishing patent office. DocDB-normalized format usually includes the filing year (2 or 4 digits) at the beginning or end unless the year is already embedded in the application number.

• US application numbers in DocDB format have changed since late 2010 (beginning of series code 13, see link below for more details). USPTO "original" format always includes a prepended series code. 
• WO application numbers are formatted with a 2-digit year followed by a 5-digit serial number prior to 2004-01-01. Beginning with application dates in 2004, the format is 4-digit year followed by 6-digit serial number (e.g. 9813495 or 2004000001). A kind code of "W" must be used to distinguish WO applications from national office applications.
• JP application numbers include a 2-digit year as suffix until 2000; thereafter the 4-digit year is prepended (e.g. 131699 or 2007000849). 

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

kind

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Kind code of applications comes from DocDB. Values include:

A=Patent
U=Utility
P=Provisional application
W=PCT
F=Design
T=Translation

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

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Date of filing (YYYYMMDD)
Note: If no date is present and a document-id element exists, a default value of 00010101 is inserted.

lang

Original language of filing, 2-character code based on ISO 639-2.
Note: The default value is "XX" if no language information is provided by the data source.