DERIS has achieved a Gold ranking in the “Litigation and Transactions” category and has been listed as Highly Recommended in the “Prosecution” category in the IAM Patent 1000: The World’s Leading Patent Professionals 2025. Furthermore, eight of our attorneys have been acknowledged as recommended individuals.

• Mehmet Nazım Aydın Deriş – Litigation and Transactions: Gold
• Serra Coral – Litigation and Transactions: Silver; Prosecution: Recommended
• E. Kerim Yardımcı – Litigation and Transactions: Silver
• Okan Can – Litigation and Transactions: Gold
• Muazzez Korutürk – Litigation and Transactions: Bronze
• Oya Yalvaç – Prosecution: Recommended
• Elif Arabacıoğlu – Litigation and Transactions: Bronze
• Başak Yiğiter – Prosecution: Recommended

IAM’s assessment of DERIS:
“DERIS has become a hallmark of excellence in Türkiye's IP landscape, since it was established in 1936. The firm is renowned for its bespoke approach and immense technical expertise, placing its clients’ needs at the forefront of its services. The team's dedication and unwavering commitment have fostered enduring relationships with a distinguished roster of patrons in fields such as pharmaceuticals and materials, where strategic prowess is crucial. Setting the pace, Mehmet Nazım Aydın Deriş stands as a beacon within the local legal landscape. Possessing profound technical and legal expertise, he is comfortable with any of the IP settings and is a trusted adviser in Turkish IP law. On the prosecution side, dual-qualified Turkish and European patent attorneys Oya Yalvaç and Başak Yiğiter exemplify the group’s prowess. They call upon immense in-house experience within the pharmaceutical industry and a thorough understanding of patent law to offer meticulously conducted early-stage assessments, creative strategies and vital support during various actions. A versatile IP professional, Serra Coral has all the bases covered on both the contentious and non-contentious fronts. A polyglot boasting fluency in Turkish, English and French, her linguistic skills, paired with her legal expertise, make her an attractive choice for global patent work. The outfit's renowned bench of litigators includes the likes of Okan Çan, Kerim Yardimci, Muazzez Korutürk and Elif Arabacıoğlu. Both local and international patrons hold Çan in high esteem, consistently turning to him for his exceptional expertise, unparalleled precision and deep analytical skills, particularly during patent infringement cases. With a bird's-eye view of the latest developments in law and regulations, Yardimci is a prime choice for complex, big-ticket disputes, consistently striving for exceptional results and exceeding client expectations. Korutürk, enlisted by a wide range of sectors, has long established herself as the go-to choice for top-notch representation, particularly among players in the life sciences, chemicals and mechanics industries. Rounding off the line-up, Arabacıoğlu continues to demonstrate great courtroom acumen, and her transparent, commercially sound advice has garnered favour among leading names in the pharmaceutical and chemical scene.”

The Patent 1000 focuses exclusively on patent practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal patent expertise.