GENEVA, April 4 -- KUNLUN DIGITAL TECHNOLOGY CO., LTD. (Room 1501, Gehua Building, No. 1 Qinglong HutongDongcheng District, Beijing 102211), 昆仑数智科技有限责任公司 (中国北京市东城区青龙胡同1号歌华大厦1501室), CHINA NATIONAL PETROLEUM CORPORATION (9 Dongzhimen North StreetDongcheng District, Beijing 100007), 中国石油天然气集团有限公司 (中国北京市东城区东直门北大街9号) filed a patent application (PC...