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Bulgarian and European Patent, Trademark & Design Attorney: Konstantin Tahtadjiev
Quick facts
Partners

Konstantin Tahtadjiev

Total number of lawyers

1

Practitioners (worldwide)

1

Languages

English, Bulgarian

Network memberships

AIPPI, EPI

Key practice areas
Copyright & related rights
Intellectual property
Trade mark
Patent
Designs
Firm overview

Established in 1993, patent bureau “K TAHTADJIEV” is one of the leading Industrial Property (IP) offices in Bulgaria, practicing Industrial property for over 35 years. Possessing qualifications such as EQE qualified European patent attorney and European Trademark Attorney, our expertise and practice spreads around Europe and globally as well. We have gained considerable experience over time teaming up and networking with globally acclaimed IP law firms and foreign multinational companies from the industry.

The bureau’s emphasis is on preparation, filing and prosecution of Bulgarian patent applications, European patent applications, European Patent Validations, European Patent Validation in Bulgaria, PCT applications, PCT national phase in Bulgaria, EURO-PCT regional phases, utility model registrations, trademark registrations and industrial design registrations, as well as the maintenance and defense of the obtained industrial property rights for Bulgarian and foreign clients.
We are trained to offer patent prosecution advice in all traditional technical fields as well as in those of the most recent technologies from mechanics to electronics and telecommunications, from chemistry and pharmaceutics to biotechnology, from the topography of semiconductors to the patent protection of software.

We aim at attaching great importance to repeatedly analyzing and optimizing strategies in industrial property (IP) rights concerning the relationship between costs and benefits for our clients in particular. Our philosophy is that in the protection of industrial property rights, the technical qualification and concrete argumentation count above all else.

Our identification with the requirements of our clients reveals itself in detail, showing our technical competence and individual approach. We strongly believe that in the present dramatically increasing innovation trends, the “out-of-the-box” thinking in protecting IP should be high on our agenda.

Practice Areas & Sector Specialisations

Key practice areas:

Designs, Intellectual property, Intellectual property (contentious), Intellectual property (prosecution), IP transactions, Patent, Patent (contentious), Patent (prosecution), Trade mark, Trade mark (contentious), Trade mark (prosecution)

Key Sector Expertise: 

Biotechnology, Chemical, Computer technology & services, Electrical, Electronics, Food and beverage, Life sciences, Mechanical, Medical device, Pharmaceutical, Robotics, Technology hardware, Telecommunication

Address:
j.k. Goce Delchev bl. 237, vh. B, et. 4, ap. 28
Sofia, 1404, Bulgaria
Tel:+35928580345 Email:Contact Us Web Address:https://www.ktpatent.com
2026 Edition
Patent
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Overview

The firm led by Konstantin Tahtadjiev, known as K Tahtadjiev, is a prominent Bulgarian and European patent agency established in 1993.The firm specializes in the preparation, filing, and prosecution of Bulgarian and European patent applications, utility model registrations, trademark registrations, and industrial design registrations. 

Notable practitioners: Konstantin Tahtadjiev

Testimonials

2026

"K Tahtadjiev and his team demonstrate exceptional strategic vision, unparalleled expertise, and relentless dedication in IP litigation. Their professionalism, precision, and commitment to achieving results are truly outstanding, making them an invaluable partner in securing and defending intellectual property rights."

"They thoroughly examine each case from every possible angle, ensuring no detail or opportunity is overlooked. Their professionalism, foresight, and ability to navigate complex IP challenges with clarity and precision make them an invaluable advisor. They consistently provide thoughtful, actionable advice that drives optimal outcomes for intellectual property matters."

"He is pleasant, easy to work with, efficient, and provides excellent value for money.  High-quality legal work."

"Exceptional attention to the company’s issues and a highly responsible approach."

Konstantin Tahtadjiev

"Konstantin Tahtadjiev excels in combining deep professional expertise with innovative and unconventional thinking. He consistently approaches complex IP challenges with creativity, foresight, and strategic insight, delivering solutions that are both effective and forward-thinking."

Kliment Markov

"Kliment is competent and responsible and works proactively and collaboratively to achieve the required solution for the client. In particular, Kliment's ability to advice and correspond in fluent English is a valued skill for a practitioner who does not speak Bulgarian."

 

2025

“Attention to detail ensures that all aspects of IP protection, from preliminary searches to application submission, are meticulously handled.”

“Communicates complex legal concepts in a clear and concise manner, and fosters confidence and understanding for clients”.

"Comprehensive and client-centric approach.”

“Consistently demonstrates a deep understanding of IP laws and regulations, coupled with a strategic mindset tailored to meet the specific needs of each case.

"Extensive expertise in IP property law, particularly in the area of trade mark registration. Has a proven track record in handling complex trade mark applications, combined with a thorough understanding of the legal frameworks and procedural nuances”.

"Great price, very detailed and quick responses."

“Meticulous attention to detail and ability to provide strategic, client-focused advice ensured that the client's trade mark application would be both robust and aligned with their business objectives.”

"Personal attention, good communication, and a friendly but professional approach."

“Proactive attitude, reliability, and dedication to achieving the best outcomes make services invaluable."

“Professional reliability and ability to deliver high-quality results within tight timelines further reinforced my decision to engage."

"Responsive and explains everything in detail in an easily understandable manner."

"Smart, friendly, very knowledgeable about IP – and provides tremendous value for money."

Linked Reviews
Designs

Case studies show the firm assisted Shenzhen Viewplay company in filing and prosecution of two designs in the European Union. 

Patent

Case studies show that the firm advised an Integral Med Solutions active in Pharmaceuticals / dietary supplements in Filing and prosecution of PCT application before the Bulgarian patent office.

 
Trade mark

Case studies demonstrate that the firm represented firm ENEA focused on green energy solutions in Opposition to two Bulgarian trademark applications. 

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