In Romania, during the communist regime, all inventions considered of interest for the economy had to be assigned by their inventors to the state, through its institutions (such as ministries) or companies which were all entirely owned by the state. However, all inventions considered of interest that were not assigned by their inventors in favor of the state, were expropriated for the benefit of the latter. As a consequence of the legal or voluntary assignment, an author/inventor certificate was granted to the inventors who were also entitled to a consideration based on the advantages brought by the effective application of the inventions. In practice, in many cases, even if the law provided this consideration, it was not paid to the inventors.