INTERNATIONAL PATENT: PETROCHINA SHANGHAI ADVANCED MATERIALS RESEARCH INSTITUTE CO. LTD, 中石油（上海）新材料研究院有限公司, PETROCHINA COMPANY LIMITED, 中国石油天然气股份有限公司 FILES APPLICATION FOR "PREPARATION METHOD FOR LACTIDE AND DIRECT LACTIDE AND DEPOLYMERIZED LACTIDE"

GENEVA, April 17 -- PETROCHINA SHANGHAI ADVANCED MATERIALS RESEARCH INSTITUTE CO. LTD (116 Linjun Rd, Lin-Gang Special Area, China (Shanghai) Pilot Free Trade ZoneShanghai 201306), 中石油（上海）新材料研究院有限公司 (中国上海市中国（上海）自由贸易试验区临港新片区临隽路116号), PETROCHINA COMPANY LIMITED (9 Dongzhimen North StreetDongcheng District, Beijing 100007), 中国石油天然气股份有限公司 (中Þ...