INTERNATIONAL PATENT: PETROCHINA COMPANY LIMITED, 中国石油天然气股份有限公司, CNPC RESEARCH INSTITUTE OF SAFETY & ENVIRONMENT TECHNOLOGY CO., LTD., 中国石油集团安全环保技术研究院有限公司 FILES APPLICATION FOR "METHOD FOR SEPARATION AND QUALITY-CLASSIFIED REUSE OF WATER PURIFIED BY STRIPPING AND SYSTEM"

GENEVA, Nov. 30 -- PETROCHINA COMPANY LIMITED (9 Dongzhimen North StreetDongcheng District, Beijing 100007), 中国石油天然气股份有限公司 (中国北京市东城区东直门北大街9号), CNPC RESEARCH INSTITUTE OF SAFETY & ENVIRONMENT TECHNOLOGY CO., LTD. (Building 1, Yard 1, North Huanghe StreetChangping District, Beijing 102206), 中国石油集团安全环保技术研究院有限公司 (中国北京市昌平区黄河北街1号ƀ...