Analysis of patent sources in the field of environmental monitoring of objects Alexandra Petryaeva, Marina Bolsunovskaya, Svetlana Shirokova, Aleksandr Leksashov, Andrey Zhukov, Aleksander Kuptsov and Dmitry Kazakov E3S Web Conf., 284 (2021) 01005 Published online: 12 July 2021 DOI: 10.1051/e3sconf/202128401005