Trend of utility model patent filings considering the income level of countries. Research, Society and Development, [S. l.], v. 11, n. 8, p. e34811830767, 2022. DOI: 10.33448/rsd-v11i8.30767. Disponível em: https://rsdjournal.org/rsd/article/view/30767. Acesso em: 5 dec. 2025.