https://www.epo.org/en/node/search-queries-tips-and-tricks-0

Searching priority number using EPODOC format in OPS family service http://ops.epo.org/3.2/rest-services/family/priority/EPODOC/US2007875634/biblio, returns an error message, why is that?

OPS family service only supports application/priority numbers in DOCDB format:

Application/Priority numbers in EPODOC format will work only in OPS Published Service.

For more information about how to formulate EPODOC numbers see this FAQ.

For more information about how to formulate DOCDB format for application/priority and publication numbers see Useful tables and statistics, codes and coverage