Patent Assignment
Reel/Frame 044564/0330
Assignment of Assignor's Interest
Recorded: 2018-01-08
Pages: 5
Assignors
ZHANG, HONGYING
Executed: 2017-12-18
WANG, NA
Executed: 2017-12-18
HUANG, YANFU
Executed: 2017-12-18
SHI, LIN
Executed: 2017-12-18
YU, PING
Executed: 2017-12-18
Assignees
CHINA NATIONAL PETROLEUM CORPORATION
9 DONGZHIMEN NORTH STREET, DONGCHENG DISTRICT, BEIJING, 100007, CHINA
CNPC DRILLING RESEARCH INSTITUTE
A34 PLOTS, CHINA PETROLEUM INNOVATION BASE, XISHATUN BRIDGE WEST, SHAHE TOWN, CHANGPING DISTRICT, BEIJING, 102206, CHINA
BEIJING PETROLEUM MACHINERY CO.
NO. 9 NENGYUAN SOUTH 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.
Change of Name
Apr 30, 2019
From: CNPC DRILLING RESEARCH INSTITUTE
To: CNPC DRILLING RESEARCH INSTITUTE COMPANY LIMITED
Reel/Frame 049032/0496 →
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 →