The purpose of this study is to explore the technological cooperation structure of Ulsan through the analysis of the technological cooperation network. This study analyzed the network of patent applicants filed in Ulsan for 10 years from 2012 to 2021. The study conducted frequency analysis of patent networks to identify major applicants and key technology in Ulsan. The result showed patent applications have been rapidly expanding to universities and individuals, which increases the diversity of industries and technologies in the region. Especially, the study investigated co-occurrence patterns of patent applicants over time to examine collaboration trends in Ulsan. The result showed Collaborative Activities of Industry-University-Research have not yet been extensively expanded. Moreover, there is a tendency to collaborate with applicants outside the region rather than within the region. However, the local environment for technical cooperation has improved, and small-scale cooperation has recently been on the rise. In particular, local universities are not only the core of knowledge production and distribution, but also central to cooperative activities for the effective production and distribution of knowledge.