Patent Assignment
Reel/Frame 036971/0860
Assignment of Assignor's Interest
Recorded: 2015-11-05
Pages: 4
Assignors
LIU, YONGGANG
Executed: 2015-10-29
LI, XIAOJUN
Executed: 2015-10-29
FENG, CHUN
Executed: 2015-10-29
LI, FANGPO
Executed: 2015-10-29
Assignees
CHINA NATIONAL PETROLEUM CORPORATION
9 DONGZHIMEN NORTH STREET, DONGCHENG DISTRICT, BEIJING, CHINA
CNPC TUBULAR GOODS RESEARCH INSTITUTE
NO. 32, DIANZI ER ROAD, XI AN, SHAN XI, CHINA
Covered Property
(1)
Connection Structure Between Pipe Body and Steel Joint of Aluminum Alloy Drill Pipe