Patent Assignment
Reel/Frame 049032/0496
Change of Name
Recorded: 2019-04-30
Pages: 4
Assignor
CNPC DRILLING RESEARCH INSTITUTE
Executed: 2017-11-24
Assignee
CNPC DRILLING RESEARCH INSTITUTE COMPANY LIMITED
NO.1 BUILDING, NO.5 COURTYARD,, HUANGHE STREET, CHANGPING DISTRICT,, BEIJING, 102206, CHINA
Covered Property
(1)
Cementing Plug
Related Assignments
(2)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignor's Interest
Jan 8, 2018
From: ZHANG, HONGYING; WANG, NA; HUANG, YANFU; SHI, LIN
To: CHINA NATIONAL PETROLEUM CORPORATION; CNPC DRILLING RESEARCH INSTITUTE; BEIJING PETROLEUM MACHINERY CO.
Reel/Frame 044564/0330 →
Change of Name
May 2, 2019
From: CNPC DRILLING RESEARCH INSTITUTE COMPANY LIMITED
To: CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED
Reel/Frame 049067/0836 →