INTERNATIONAL PATENT: CHINA UNIVERSITY OF PETROLEUM, 中国石油大学（华东）, QINGDAO CHINA UNIVERSITY OF PETROLEUM EDUCATION DEVELOPMENT CO., LTD, 青岛中石大教育发展有限公司 FILES APPLICATION FOR "SALT-RESISTANT GUAR GUM FRACTURING FLUID CROSSLINKER AQUEOUS SOLUTION AND PREPARATION METHOD THEREFOR AND USE THEREOF"

GENEVA, June 22 -- CHINA UNIVERSITY OF PETROLEUM (66 Changjiang West Road, Huangdao DistrictQingdao, Shandong 266400), 中国石油大学（华东） (中国山东省青岛市黄岛区长江西路66号), QINGDAO CHINA UNIVERSITY OF PETROLEUM EDUCATION DEVELOPMENT CO., LTD (66 Changjiang West Road, Economic And Technological Development ZoneQingdao, Shandong 266427), 青岛中石大教育发展有限公司 (中国山东省青岛市经济技术开发区长江西&...