GENEVA, Oct. 26 -- NANJING DADE STEEL PIPE CO., LTD (No.331, Zhening East Road, Lishui Economic Development ZoneNanjing, Jiangsu 211200), 南京大得钢管有限公司 (中国江苏省南京市溧水经济开发区柘宁东路331号) filed a patent application (PCT/CN2024/090728) for "COMBINED STRUCTURAL STEEL PIPE WITH SPIRAL CORRUGATIONS ON OUTER WALL, AND MANUFACTURING APPARATUS AND METHOD" on Apr 30, 2024. With publication no. WO/2025/217957, the details related to the patent application was published on Oct 23, 2025.
Notably, the patent application was submitted under the International ...