- Instituto Nacional da Propriedade Intelectual ( INPI): https://inpi.justica.gov.pt/
- Inspeção Geral das Atividades Culturais ( IGAC): https://www.igac.gov.pt/
- European Patent Office ( EPO): https://www.epo.org/
- World Intellectual Property Organization ( WIPO): https://www.wipo.int/
Patent databases
- Espacenet: https://worldwide.espacenet.com/
- Patentscope: https://patentscope.wipo.int/search/en/search.jsf
- Google Patents: https://patents.google.com/
- INPI: https://servicosonline.inpi.pt/pesquisas/main/patentes.jsp?lang=PT