 <publication-reference fvid="71329085" ucid="US-5551212-A" entity-status="large">
   <document-id>
     <country>US</country>
     <doc-number>5551212</doc-number>
     <kind>A</kind>
     <date>19960903</date>
     <lang>EN</lang>
   </document-id>
 </publication-reference>

Attribute

Description

fvid

Unique database-level integer identifier

ucid

See Common XML Attributes

entity-status

Description of filing entity based on number of employees (US only). Values include:

micro
small
large
unknown

publication-reference/document-id

Element

INID

Description

country

19

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

doc-number

11

doc-number is generally provided in DocDB-normalized format. Exceptions include WO documents, where the doc-number is normalized to YYYYnnnnnn and US pre-granted documents where the doc-number is normalized to YYYYnnnnnnn. We also recommend checking the Release Notes for patent number or kind code changes.
Patent document numbering is a complex subject, as the examples below illustrate:

Patent Authority	Patent Number
US	3732068
	RE31783
US (Plant)	5382
US (Design)	D436240
EP	0129539
WO	1985000002
JP	60000013
	2006000022
DE	3244404

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 13 The 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.

date 14 Date of publication (YYYYMMDD)
Note: If no date is present and a document-id element exists, a default value of 00010101 is inserted.

lang 12 Original language of publication, 2-character code based on ISO 639-2.
Note: The default value is "XX" if no language information is provided by the data source.

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publication-reference

publication-reference/document-id