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So-called non-core technologies that currently do not fit in the strategic focus of a company may nevertheless contain great future opportunities. However, dealing with these technologies (or research surplus) necessitates changes in the organizational structure and efficient management practices. In this paper, we develop a portfolio tool, Research Surplus Portfolio (RSP), for managing non-core technologies. Within the RSP system, we concentrate on the following key phases of the management process: the storage of non-core technologies, the maintenance of the portfolio, and evaluation of technologies. We also discuss the tools and metrics that can be applied within the RSP for evaluating technologies.