DDBJ provides amino acid (AA) sequence data transferred from Japan Patent Office (JPO) and Korean Intellectual Property Office (KIPO) as cumulated files at following site.
ftp://ftp.ddbj.nig.ac.jp/ddbj_database/patent/
Since December 2014, DDBJ has changed the update timing of cumulated files from every three months to followings.
[1] JPO data (Once or twice per month)
[2] KIPO data (Twice per year)
[3] JPO/KIPO data update or other process (Irregular date)
AA sequence data can be also retrieved through getentry by accession number and through ARSA by keyword.