AUTHOR=Wang Haibo , Zhang Le , He Jiayuan , Zhou Tong TITLE=The Development of Natural Gas Hydrate Exploitation Technology From Perspective of Patents JOURNAL=Frontiers in Energy Research VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.860591 DOI=10.3389/fenrg.2022.860591 ISSN=2296-598X