(1) Log in to the official website of the Bulgarian Intellectual Property Office ( bpo.bg/ ) and click "English" on the upper right side of the homepage to switch to the English page;

(2) Click "Registers" on the English page, enter the database page, and select "State register of patent";

(3) On the query page, select the query item under the "Advanced Search" column, then enter the relevant patent information and click "Search" to query the patent;

(4) Click on the patent number you want to query to view the specific information of the patent.

Bulgarian patent annual fees