Retrieve patent bibliographic data and INPADOC family members via EPO Open Patent Services (OPS) API

Steps

1. Register at the EPO Developer Portal (developers.epo.org) and obtain a Consumer Key and Consumer Secret for the Non-paying access tier
2. Exchange credentials for an OAuth 2.0 access token by POSTing to https://ops.epo.org/3.2/auth/accesstoken with grant_type=client_credentials and a Base64-encoded Authorization header; the token is valid for 20 minutes
3. Retrieve bibliographic data for a known publication number with GET /3.2/rest-services/published-data/publication/epodoc/{publicationNumber}/biblio; the response is XML containing title, inventors, applicants, IPC classifications, and priority claims
4. Fetch the INPADOC patent family (equivalent filings across jurisdictions) with GET /3.2/rest-services/family/publication/epodoc/{publicationNumber}/biblio; parse the family-member elements for each jurisdiction's publication number and dates
5. Query legal status events across family members with GET /3.2/rest-services/family/publication/epodoc/{publicationNumber}/legal; events include grants, expirations, and assignments