Skip to main content

U.S. Patent Citation Beta Endpoint

GET /api/v1/patent_citation/
POST /api/v1/patent_citation/
GET /api/v1/patent_citation/{patent_number}/

This will search for patents matching the query string (q) and returning the data fields listed in the field string (f) sorted by the fields in the sort string (s) using options provided in the option string (o). 

Either the HTTP GET, or POST method can be used; however, when the query parameters exceed a reasonable size (around 2,000 characters), then the POST method may be preferable. When using the POST method, the query parameters should be embedded within a JSON string within the request body. 

Requests using the lookup endpoint must include a single patent number and will use the default f, s, and o options. 

Name Description Defaults Details
q JSON formatted object containing the query parameters. See below for details on formatting this object.  

String, required 
Example: {"patent_number": "10966293"}

f JSON formatted array of fields to include in the results. If not provided, defaults to patent_number, cited_patent_number, and citation_date.

String, optional 
Example: ["patent_number", "cited_patent_number"]

s JSON formatted array of objects to sort the results. If not provided, defaults to patent_number.

String, optional 
Example: [{"citation_date": "desc"}]


JSON formatted object of options to modify the results. Use these to page through results. Available options are: 
Size: Number of results to return. 
Offset: Number of results to skip. 

Size: Defaults to 100. 

Offset: Defaults to 0. 

String, optional 
Example: {"size": 50,"offset": 100}

An example of a complete API call using the GET verb is:{"_gte":{"citation_date":"2007-01-04"}}&f=["patent_number","citation_date"]

An example of the equivalent API call using the POST verb is:

with the body containing:


An example of an API call using the lookup endpoint is:


Return the patent number and cited patent number of all first-cited patents before December 31, 1999: {"_and":[{"citation_sequence":"1"},{"_lte":{"citation_date":"1999-12-31"}}]}&f= [ "patent_number", "cited_patent_number"]

Return the cited patent number and date of all patents cited by the applicant on a given patent, sorted by date: {"_and":[{"patent_number":"9919704"},{"citation_category":"cited by applicant"}]}&f= ["cited_patent_number","citation_date"]&s= [{ "citation_date": "desc" }]

Return the patent number and citation category of ten of the patents that have cited a given patent: {"cited_patent_number":"8664792"}&f= ["patent_number","citation_category"]&o={"size":10}

U.S. Patent Citation Field List