EPO vs PatentsView

The European Patent Office's Open Patent Services (OPS) exposes bibliographic, legal-status, full-text, and image data drawn from Espacenet and the European Patent Register through a RESTful, XML-based interface secured with OAuth2 client-credentials. Non-paying registered users get up to 4 GB of data per week for free, with a EUR 2,800 annual subscription available for higher volumes. A live request to the OPS host returned a fair-use-quota rejection while still echoing the requesting Origin in its CORS headers, confirming cross-origin access is genuinely enabled rather than merely documented.

PatentsView, the NBER/USPTO-backed tool for mining trends across the US patent landscape, folded into the USPTO's unified Open Data Portal (ODP) in March 2026, retiring the standalone patentsview.org domain and its old keyless endpoint. Access now runs through ODP's api.uspto.gov gateway, which requires a free API key tied to a USPTO.gov account and returns JSON over HTTPS with CORS enabled. Every patentsview.org URL, including the one previously on file here, now 301-redirects to USPTO's own transition guide rather than serving data directly.