https://www.epo.org/en/service-support/faq/searching-patents/open-patent-services/search-formats/what-are-differences
What are the differences between the Espacenet SmartSearch and OPS bibliographic search requests?
In OPS you must use Boolean operators, in Espacenet it is optional. Both services use the Common Query Language (CQL). OPS is also faster if you do not request the bibliographic data, as the response contains publication references only.
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