HomeIP-GuideBulgaria General informationInvention (PCT National Phase) Bulgaria


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Bulgarian PCT national phase entry

from 1050.00
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. The extension of this deadline is not possible.

  • Minimum filing requirements

To obtain a filing date a Bulgarian patent application based on PCT must contain:
- a request for the grant of a patent containing the title of the invention and the data identifying the applicant, in the Bulgarian language;
- description of the invention describing at least an essence.

  • Language of the Bulgarian patent application

The official language is Bulgarian. If the PCT application was filed in any other foreign language, translation into Bulgarian should be provided within three months from national phase entry. This term cannot be extended.

  • Power of Attorney requirements

The official legalisation is not required for the Bulgarian national phase entry. The signed and stamped POA may be submitted within two months from entering the Bulgarian PCT national stage.

  • 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.

  • 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.

  • Novelty grace period 

A Bulgarian PCT application may be filed within six months after the disclosure at an officially recognized exhibition. 

  • Grant, validity term and maintenance fees 

Patents in Bulgaria are valid for 20 years from the filing date. Annual maintenance fees are due each year starting from the international filing date and should be paid within three months from receipt of the Notice of Allowance alongside fees for grant and publication. All subsequent annual fees should be paid in advance no later than the last day of the month when the anniversary of the international filing date occurs. Payment cannot be made more than 12 months prior to the anniversary of the international filing date. Late payment of annuities is possible within 6 months from the due date together with a corresponding surcharge. It is not possible to pay annuities in an accumulated manner. 

  • Representation by a patent attorney

Foreign applicants must perform the PCT national stage entry in Bulgaria through an agent, registered in Bulgaria 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 12-18 months. Initial protection term is 4 years with two renewals, 3 years each.

The above information was verified on 13.09.2021
Please contact us if the above information is not in conformity with Bulgarian IP Laws