Searching for priority number using DOCDB format in OPS Published Services gives no results although the document exists in Espacenet. I am using following query: http://ops.epo.org/3.2/rest-services/published-data/priority/DOCDB/US.87563407.A1/biblio

OPS Published services don’t support searches for application or priority numbers in DOCDB format.

You have to use EPODOC format and your query should look like this:

• http://ops.epo.org/3.2/rest-services/published-data/priority/EPODOC/US2007875634/biblio

Application/Priority numbers in DOCDB format will work only in OPS Family 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