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Marios Sideris

Marios spent 35 years at the European Patent Office (EPO), starting out in The Hague as a patent examiner in the field of internal combustion engines, a role that included training and coaching peers and new entrants.


He then became a director, initially managing examiners in the area of semiconductors and then automotive engineering. Following this, he led the EPO’s classification and documentation directorate from 2011 to 2018,     a role that included the key role of project manager for the design and implementation of the Cooperative Patent Classification (CPC) system in the EPO and USPTO. Marios also carried out a number of strategic projects in partnership with the IP5 offices (EPO, USPTO, China, Japan and South Korea), the World Intellectual Patent Organisation (WIPO) and other global offices and oversaw the automation of most of the EPO’s classification activities. During this period his team played a leading role in the definition of the minimum documentation required by WIPO to allow patent offices to become International Search Authorities.


In addition to his extensive experience at the EPO, Marios speaks five languages and holds an MSc in Engineering from the von Karman Institute for Fluid Dynamics in Belgium and a PhD from the State University   of Ghent. He has also published a book on “Methods for Monitoring and Diagnosing the Efficiency of Catalytic Converters”.

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