About the Lawyer

M.Sc. Konstantin Tahtadjiev is a highly qualified patent attorney with extensive experience in intellectual property law. He graduated from Sofia University “St. Kliment Ohridski” with a Bachelor of Science degree in Applied Mathematics and a Master of Science degree in Protection of Information in Computer Systems and Networks. Konstantin joined the IP agency K TAHTADJIEV in 2007 and has focused primarily on preparing patent and utility model applications, prosecuting both Bulgarian, PCT, and European patent applications through the grant, European patent validations, and patent searches. He has also gained extensive experience in all aspects of trademark and industrial designs cases, including trademark filing, prosecution, opposition, maintenance, searches, infringement, enforcement, and strategic issues before the Bulgarian Patent Office, EUIPO, and WIPO.

In 2018, he successfully passed all EQE exams in one go and has been qualified as a European Patent Attorney before the European Patent Office. Currently, Konstantin is among the minority of European patent attorneys practicing in Bulgaria who has been entered in the list of representatives before EPO by passing EQE and not listed under the “grandfather” clause.

Experience

Konstantin has over 15 years of experience in the field of intellectual property law. His career highlights include preparing and filing patent and utility model applications, prosecuting both Bulgarian and European patents, and handling European patent validations. He has also been involved in various trademark and industrial designs cases, including filing, prosecution, opposition, maintenance, searches, infringement, enforcement, and strategic issues.

Specialty

Patent Law

Patent Preparation and Filing: Konstantin specializes in preparing and filing patent applications for both Bulgarian and European patents.
Patent Prosecution: He has extensive experience in prosecuting patent applications through the grant process.
European Patent Validations: Konstantin is well-versed in the process of validating European patents in Bulgaria.
Patent Searches: He conducts thorough patent searches to ensure the uniqueness of inventions.
Patent Strategies: Konstantin provides strategic advice on patent protection and enforcement.

Trademark Law

Trademark Filing: He handles the filing of trademarks before the Bulgarian Patent Office, EUIPO, and WIPO.
Trademark Prosecution: Konstantin is experienced in the prosecution of trademarks, including handling oppositions.
Trademark Maintenance: He ensures the timely maintenance of trademarks to prevent their lapse.
Trademark Searches: He conducts trademark searches to identify potential conflicts.
Trademark Infringement and Enforcement: Konstantin advises on strategies for enforcing trademark rights and preventing infringement.

Industrial Designs

Industrial Design Filing: He handles the filing of industrial designs before the relevant authorities.
Industrial Design Prosecution: Konstantin is experienced in the prosecution of industrial designs, including handling oppositions.
Industrial Design Maintenance: He ensures the timely maintenance of industrial designs to prevent their lapse.
Industrial Design Searches: He conducts industrial design searches to identify potential conflicts.
Industrial Design Infringement and Enforcement: Konstantin advises on strategies for enforcing industrial design rights and preventing infringement.

Education

Master of Science in Protection of Information in Computer Systems and Networks at Sofia University
Bachelor of Science in Applied Mathematics at Sofia University “St. Kliment Ohridski”
IT Engineer – CISCO Academy

Qualifications

European Patent Attorney (EQE qualified) registered under No. 9277890
Bulgarian patent, trademark and design attorney registered under No. 398
European trademark and design attorney registered under No. 64071

Languages

English
Russian

Achievements and Recognition

Rising Star 2024: Recognized as a rising star in the field of intellectual property law.
European Patent Attorney: Successfully passed all EQE exams in one go and qualified as a European Patent Attorney before the European Patent Office (EPO).
Industry Recognition: Mentioned in the Managing IP EMEA Awards 2025 shortlist for his contributions to intellectual property achievements.
Contributions to Award-Winning Projects: Not specified, but known for his extensive experience in all aspects of trademark and industrial designs cases, including filing, prosecution, opposition, maintenance, searches, infringement, enforcement, and strategic issues before the Bulgarian Patent Office, EUIPO, and WIPO.

K Tahtadjiev Verified Firm

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