HomeIP-GuideBulgaria General informationInvention (PCT National Phase) Bulgaria


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Bulgarian PCT national phase entry

from 1121.00
Total Number of Claims/PCT
Number of Independent Claims
Number of Priorities
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  • Patent fees

Fees associated with Bulgarian PCT national phase entry as well as other patent fees are available in the fee calculator.

  • Time limits for the Bulgarian national phase entry 

The PCT application must be filed in Bulgaria within 31 months from the earliest priority date. Extension of this deadline is not possible unless the deadline falls on a non-working day in Bulgaria. If so, the deadline for national PCT entry in Bulgaria switches to the first working day.

  • Minimum filing requirements

To obtain a filing date a Bulgarian patent application based on PCT must contain:
- a request for grant of a patent containing the title of the invention for which the patent is sought, as wells as identity information about the applicant, in Bulgarian language;;
- description of the invention describing at least its essence.

  • Language of the Bulgarian patent application

The application documents shall be filed in Bulgarian. If the PCT application is filed in any other foreign language, the date of application shall be maintained if a translation into Bulgarian is provided within three months from the national phase entry. This term cannot be extended.

  • Power of Attorney requirements

Neither official legalisation, nor notarization is required for the patent grant procedure in Bulgaria. A signed and stamped copy of POA shall be submitted within three months from the deficiency notification from BPO.

  • Substantive examination request

The substantive examination on Bulgarian patent application based on PCT should be requested together with the entry into the Bulgarian PCT national phase by payment of the prescribed fee for study and expertise.

  • Time limits for amending the patent application in Bulgaria based on the PCT

The Bulgarian patent application may be amended during its pendency in the patent office until the decision to grant a patent is taken. The amendments of the application shall not be beyond the initial disclosure in the application.

  • Novelty grace period 

The disclosure of the invention shall not influence the novelty, when this disclosure is made in six months term before the date of submitting of the application for the invention, respectively before the priority date, and it is consequence of:
- obvious misuse with regard to the applicant or the previous owner of the right to application;
- exhibiting of the invention at an official or officially recognised exhibition by the applicant or the previous owner of the right to application.

The disclosure at an official or officially recognised exhibition shall not influence the novelty, if the applicant declares the exhibiting of the invention at submitting the application and in three months after the date of submitting the application presents proofs for this. 

  • Grant, validity term and maintenance fees 

The annual patent fees till the taking of decision for issuing of a patent and the fee for the current patent year shall be paid simultaneously with the fees for issuing of a patent and for publication about the issuing of the patent. Patents in Bulgaria are valid for 20 years from the international filing date. This term can be extended by a maximum to 25 years if Supplementary protection certificate (SPC) has been applied for and subsequently granted for patents concerning pharmaceutical and plant protection products. Maintenance fees shall be annually paid to the Bulgarian Patent Office in respect of each patent year, starting from the international filing date of the Bulgarian patent application, during the term of the granted Bulgarian patent. The annual patent fee for each following patent year shall be paid in advance at latest on the last day of the month in which expires the previous patent year. The payment cannot be made for more than one patent year. Late payment is possible within 6 months grace period by paying a corresponding surcharge. 

  • Representation by a patent attorney

Applicants who are not established in the Republic of Bulgaria or in another Member State of the European Union, in a state - party to the European Economic Area Agreement or in the Swiss Confederation, must perform the patent prosecution in Bulgaria through an agent, a registered Bulgarian patent attorney.

  •  Notes

1. Online Databases: Bulgarian Patents, European Patents (EPO) Search.
2. The PCT application in Bulgaria may be nationalised via registration of the European patent and its further validation in Bulgaria.
3. PCT applications may also be protected as Utility Models in Bulgaria, which are subject to formal examination only. Methods, chemical compounds and use of a product are not protectable. Time frame for registration of utility models is 3-6 months. Initial protection term is 4 years with two renewals, 3 years each.

Please contact us if the above information is not in conformity with Bulgarian IP Laws