// OSINT OPEN ACCESS RESEARCH

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Espacenet:
European Patent Office database indexing over 150 million international patent publications, legal statuses, and technical disclosures.
Google Patents:
Full-text international patent search engine indexing global grants, applications, prior art, and non-patent literature.
USPTO Patent Public Search (PPUBS):
Official full-text search engine provided by the U.S. Patent and Trademark Office for published patent applications and patent grants.