• The application for issuance of a certificate for additional protection must contain:
• Application with the name of the product for which additional protection is requested and the identification data of the applicant, according to a sample of the Patent Office.
• name of the product for which a certificate is sought;
• data for the main patent - the title of the invention, the patent number and the expiration date of the patent;   
• name and address of the applicant (s) for the certificate application;   
• name and address of the industrial property representative, if used;   
• correspondence address;   
• the number and date of the first authorization to place the product on the market in the Republic of Bulgaria and, if that authorization is not the first authorization to place the product on the market in the Community, the number and date of that authorization.

Attachments:

• a copy of the authorization to place the product on the market in which the product is identified;
• if the authorization referred to above is not the first authorization to place the product on the market in the Community, information on the identity of the product so authorized and the legal provision under which the authorization procedure took place, together with a copy of the notification of the official publication of the authorization.
• Power of attorney of an industrial property representative, when authorized.

The term for submitting an application for a supplementary protection certificate shall be 6 months from the issue of the first authorization to place the product on the market or from the notification of the grant of the basic patent, as applicable.

An application for the issue of a supplementary protection certificate shall be filed with the Patent Office, by fax, by e-mail or by a postal operator..

For all actions related to the filing of an application, the proceedings in the Patent Office, the issuance of a protection document and the publications, fees are paid according to the current Tariff of Fees collected by the Patent Office of the Republic of Bulgaria.

Bibliographic information on the application shall be published in the Official Bulletin of the Patent Office immediately after it is established that the formal requirements have been met and a publication fee for the application has been paid.

Changes can be submitted at any time in the procedure and the changes must not go beyond the initial disclosure and after payment of the relevant fee.

The term of validity of the issued certificate is determined by the Patent Office and comes into force after the expiration of the 20-year term of validity of the basic patent. This period may not exceed 5 years. Fees for the calculated period of validity of the supplementary protection certificate shall be paid in the 20th patent year of validity of the basic patent.

The due fees can be paid at the cash desk in the Office, by bank transfer, by standard bank transfer, as well as by electronic banking. The bank account is indicated on the website of the Office.

The issuance of a duplicate is part of the administrative services provided by the Patent Office. The application shall be filed in free form or in a form of the Patent Office by the holder of the registration, by paying a corresponding fee under the Tariff for fees collected by the Patent Office of the Republic of Bulgaria.