GENEVA, April 13 -- QINGDAO SPECIAL IRON AND STEEL CO., LTD (No. 1886, Jicheng Road, Boli Town, Huangdao DistrictQingdao, Shandong 266000), 青岛特殊钢铁有限公司 (中国山东省青岛市黄岛区泊里镇集成路1886号) filed a patent application (PCT/CN2025/114634) for "HEAT-TREATMENT-FREE 1670-MPA-GRADE HOT-ROLLED PRESTRESSED STEEL BAR AND PRODUCTION METHOD THEREFOR" on Aug 14, 2025. With publication no. WO/2026/073485, the details related to the patent application was published on Apr 09, 2026.
Notably, the patent application was submitted under the International Patent Classification (I...