Partners and founders of the company

Liudmyla PORTNA

Managing Partner, Patent Attorney

Experience and Education:


Liudmyla graduated from the National University for Food Technologies gaining specialization in biotechnology, microbiology, chemistry, organization of technological processes. She has also gained extensive industry experience working in research lab of the leading Ukrainian Pharmaceutical Enterprise as well as at the Scientific Research Institute NPO “SPECTR”.


Beginning from 1993, Mrs. Portna focused her efforts on technology innovations and viable strategies for protection of Intellectual Property graduating from Institute for Intellectual Property and Kyiv Law University of the Academy od Sciences of Ukraine gaining Masters of Law degree and certification of the Patent Attorney of Ukraine allowing her to practice in the field of inventions, utility models, industrial designs, trademarks, as well as to practice law.


In 1995 she proceeded to co-found the first leading Intellectual Property firm in Ukraine A. Prigof and Partners representing significant number of high - profile corporate patent portfolios such as ORTO-PHARM, INC (US), E.I.Du Pont Ne MOURS and Company, Janssen Pharmaceutica N.V. (B.E.), Chinoin Pharmaceuticals (now Sanofi), Smithkline Beechem P.L.S. (G.B.), Agouron Pharmaceuticals Ink. (US), CENTOCOR INC. and many others.


Since 2003 she is the Managing Director, Partner and Patent Attorney at International Patent and Law firm D&L CONSULT, LLC which she co-founded with the Patent Attorney of Ukraine Diana Portna. Later the co – founded International Center for Patent Services and Translations D&L Patent, that are both marketed under the umbrella brand D&L IP GROUP.


Thanks to a wide range of partners and many years of experience, both companies successfully represent clients and have a large portfolio of registered trademarks and issued patents on inventions owned by companies and/or individuals based in Ukraine, European Union, USA, etc as well as completed translations of patent applications as a leading patent translation vendor.


LANGUAGES: Russian, Ukrainian, German, English.


Patent attorney of Ukraine, registration number 212.
Partner. Director of Development

Diana Portna is a co-founder of the firm and is involved in the strategic development and client relations. She is focusing her practice on developing global trademark prosecution and enforcement strategies for major clients worldwide. Diana Portna has a winning record of overcoming provisional refusals under Madrid Protocol in Ukraine and US and is currently developing US trademark prosecution and conflict resolution offering for domestic clients.


Ms Portna graduated from Department of Law of Kiev National Economic University in 2001. While still at school, she was assisting a group of prominent attorneys with maintenance of high -profile patent and trademark portfolios and intellectual property enforcement matters in Ukraine.


In 2002, Diana obtained an advanced degree in Intellectual Property and Law (with honors) and passed qualifying exam to become a Patent Attorney of Ukraine. Thereafter, Ms. Portna worked in the Intellectual Property Practice Group of Baker & McKenzie at its Kiev Office where she coordinated national trademark and patent filing, contributed Ukrainian chapter to a worldwide trademark clearance projects, drafted winning oppositions to provisional refusals under Madrid Agreement and Protocol, provided clients with advice on IP enforcement in the Ukrainian legal environment and otherwise actively participated in a vibrant international IP practice closely interacting with European IP Practice group as well as with in house corporate IP departments of major corporations.


In 2003, Diana Portna successfully graduated from Franklin Pierce Law Center, Concord, NH, United States, with Master's Degree (LLM) in Intellectual Property Law, Technology Transfer and E-Commerce and worked for a major International Law Firm in the US before re-joining D&L in Ukraine where has been practicing domestic and international trademark law for 20 years.


Diana is a member of National Association of Patent Attorneys of Ukraine, International Trademark Association and is an active participant of all major IP Conferences worldwide having a wide network of partners and associates globally.

In 2023, Diana Portna passed NY Bar Exam which allowed D&L IP GROUP to expand adding direct US Trademark Practice to its offering for IT start-ups, service providers and marketplace sellers looking to enter US market.


CERTIFICATIONS: Patent Attorney of Ukraine, Mediator - Intellectual Property Disputes.

LANGUAGES: Russian, Ukrainian, English, Hebrew