Patent Activity and R&D in Bulgaria

The input-output interrelation between the scientific, technological and innovation system in Bulgaria is studied here, based on the indicators: staff and expenses for R&D and patents issued for inventions. By means of a general and a differentiated institutional analysis, the key issues in view of patent effectiveness of the Bulgarian R&D and innovations are outlined in this article, both for the country in general and especially for R&D institutions. A comparative analysis is made in terms of indicators between Bulgaria and some EU countries.