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Patent Assignment Assignee Details

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Assignee Name : KEY ENERGY SERVICES, INC.

Total Assignments: 39

Assignment: 1

Reel/Frame:	013774/0865			Pages:	3
		Recorded:	02/25/2003
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

UNITRACK SERVICES, L.P.

Exec Dt:

02/14/2003

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, STE. 4400

MIDLAND, TEXAS 79705

Properties

Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #
6079490	NONE		09058477	6377189	NONE		09281864	6212763	NONE		09342564
6276449	NONE		09533511	6253849	NONE		09534599	6209639	NONE		09534601
6213207	NONE		09535239	6241020	NONE		09535555	6374706	NONE		09768551
6728638	US20020156582		09838857	NONE	US20020153134		09839080	NONE	US20020156730		09839103
NONE	US20020156670		09839411	6826492	US20020156591		09839444	6578634	US20030042020		09945924
6758095	US20030188584		10046688	7006009	US20030183382		10113609	7004456	US20040065874		10263630

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE
	MATTHEW F. STEINHEIDER
	750 BERING DRIVE
	HOUSTON, TX 77057

Assignment: 2

Reel/Frame:	013903/0390			Pages:	2
		Recorded:	03/25/2003
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

03/20/2003

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7004456

US20040065874

10263630

Correspondence name and address
	HOWREY SIMON ARNOLD, & WHITE
	MATTHEW F. STEINHEIDER
	750 BERING DRIVE
	HOUSTON, TX 77057

Assignment: 3

Reel/Frame:	014103/0469			Pages:	2
		Recorded:	05/19/2003
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

04/08/2003

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7064677

US20030196798

10440633

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE
	MATTHEW F. STEINHEIDER
	750 BERING DR.
	HOUSTON, TX 77057

Assignment: 4

Reel/Frame:	014357/0250			Pages:	4
		Recorded:	02/19/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

PRECISION DRILLING CORPORATION

Exec Dt:

02/12/2004

Assignee

KEY ENERGY SERVICES, INC.

400 SOUTH RIVER ROAD

NEW HOPE, PENNSYLVANIA 18938

Property

Pat #

Pub #

Intl #

App #

5297631

NONE

08044187

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	JILL A. MCWHIRTER
	750 BERING DRIVE
	HOUSTON, TX 77057-2198

Assignment: 5

Reel/Frame:	014357/0254			Pages:	4
		Recorded:	02/19/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

PRECISION DRILLING CORPORATION

Exec Dt:

02/12/2004

Assignee

KEY ENERGY SERVICES, INC.

400 SOUTH RIVER ROAD

NEW HOPE, PENNSYLVANIA 18938

Property

Pat #

Pub #

Intl #

App #

5439066

NONE

08266011

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	JILL A. MCWHIRTER
	750 BERING DRIVE
	HOUSTON, TX 77057-2198

Assignment: 6

Reel/Frame:	014357/0260			Pages:	4
		Recorded:	02/19/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

PRECISION DRILLING CORPORATION

Exec Dt:

02/12/2004

Assignee

KEY ENERGY SERVICES, INC.

400 SOUTH RIVER ROAD

NEW HOPE, PENNSYLVANIA 18938

Property

Pat #

Pub #

Intl #

App #

5027903

NONE

07554248

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	JILL A. MCWHIRTER
	750 BERING DRIVE
	HOUSTON, TEXAS 77057-2198

Assignment: 7

Reel/Frame:	015230/0259			Pages:	3
		Recorded:	04/16/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

WILKINSON, JEFFERY M.

Exec Dt:

04/16/2004

Assignee

KEY ENERGY SERVICES, INC.

400 S. RIVER ROAD

NEW HOPE, PENNSYLVANIA 18938

Property

Pat #

Pub #

Intl #

App #

7066266

US20050230117

10826783

Correspondence name and address
	WONG CABELLO LUTSCH RUTHERFORD ET AL
	JOHN C. CAIN
	20333 SH 249, SUITE 600
	HOUSTON, TX 77070

Assignment: 8

Reel/Frame:	014680/0628			Pages:	3
		Recorded:	06/01/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

HOOD, JOHN CHARLES

Exec Dt:

05/11/2004

LOWE, W. BRUCE

Exec Dt:

05/11/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

NONE

US20040226712

10437673

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 9

Reel/Frame:	014680/0669			Pages:	3
		Recorded:	06/01/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

HOOD, JOHN CHARLES

Exec Dt:

05/11/2004

LOWE, W. BRUCE

Exec Dt:

05/11/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

NONE

US20040226712

10437673

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 10

Reel/Frame:	015440/0236			Pages:	2
		Recorded:	06/07/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

06/01/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7221155

US20040196032

10760650

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 11

Reel/Frame:	015440/0335			Pages:	3
		Recorded:	06/07/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

NEWMAN, FREDERIC M.

Exec Dt:

06/01/2004

NORTHCUTT, KEVIN

Exec Dt:

06/01/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE

SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7228899

US20040188088

10778846

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER
	750 BERING DRIVE
	HOUSTON, TEXAS 77057

Assignment: 12

Reel/Frame:	015440/0371			Pages:	3
		Recorded:	06/07/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

NEWMAN, FREDERIC M.

Exec Dt:

06/01/2004

NORTHCUTT, KEVIN

Exec Dt:

06/01/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7029422

US20040192507

10778835

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 13

Reel/Frame:	015658/0308			Pages:	2
		Recorded:	08/04/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

07/16/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

6898983

US20040089076

10292715

Correspondence name and address
	HOWREY SIMON ARNOLD, ET AL.
	MATTHEW E. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 14

Reel/Frame:	015801/0758			Pages:	3
		Recorded:	09/15/2004
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/14/2004

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

NONE

US20040162658

10720594

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	MATTHEW F. STEINHEIDER, REG. NO. 47,968
	750 BERING
	HOUSTON, TEXAS 77057

Assignment: 15

Reel/Frame:	016227/0388			Pages:	2
		Recorded:	01/13/2005
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

01/07/2005

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7226037

US20060163545

10925813

Correspondence name and address
	BOWREY SIMON ARNOLD & WHITE LLP
	750 BERING
	HOUSTON, TX 77057

Assignment: 16

Reel/Frame:	016227/0408			Pages:	3
		Recorded:	01/14/2005
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

NEWMAN, FREDERIC M.

Exec Dt:

01/07/2005

HERRING, PAUL

Exec Dt:

01/07/2005

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7006920

US20050103491

10957309

Correspondence name and address
	HOWREY SIMON ARNOLD ET.AL.
	MATTHEW F. STEINHEIDER
	750 BERING
	HOUSTON, TX 77057

Assignment: 17

Reel/Frame:	016258/0356			Pages:	2
		Recorded:	01/31/2005
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDRIC M.

Exec Dt:

01/20/2005

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

7461830

US20050114001

10942730

Correspondence name and address
	HOWREY SIMON ARNOLD ETAL.
	750 BERING
	HOUSTON, TEXAS 77057

Assignment: 18

Reel/Frame:	016584/0461			Pages:	2
		Recorded:	05/19/2005
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

04/21/2005

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

NONE

US20030147253

10066576

Correspondence name and address
	HOWREY SIMON ARNOLD & WHITE, LLP
	750 BERING
	HOUSTON, TX 77057

Assignment: 19

Reel/Frame:	016805/0752			Pages:	2
		Recorded:	07/25/2005
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

07/19/2005

Assignee

KEY ENERGY SERVICES, INC.

6 DESTA DRIVE, SUITE 4400

MIDLAND, TEXAS 79705

Property

Pat #

Pub #

Intl #

App #

NONE

US20050252279

11087366

Correspondence name and address
	HOWREY SIMON ARNOLD, ET AL.
	750 BERING
	HOUSTON, TX 77057

Assignment: 20

Reel/Frame:	016308/0392			Pages:	3
		Recorded:	07/26/2005
Attorney Dkt #:	304-0003US
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

WILKINSON, JEFFERY M

Exec Dt:

07/25/2005

Assignee

KEY ENERGY SERVICES, INC.

400 S. RIVER DRIVE

NEW HOPE, PENNSYLVANIA 18938

Property

Pat #

Pub #

Intl #

App #

7273104

US20060021753

11161185

Correspondence name and address
	WONG, CABELLO, LUTSCH, RUTHERFORD & BRUC
	P.C.
	20333 SH 249
	SUITE 600
	HOUSTON, TX 77070

Assignment: 21

Reel/Frame:	018288/0611			Pages:	3
		Recorded:	09/05/2006
Attorney Dkt #:	08876.105055
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/01/2006

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY, SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7359801

US20070056746

11516105

Correspondence name and address
	JAMES M. HANNON, ESQ.
	KING & SPALDING LLP
	SUITE 4000, 1100 LOUISIANA
	HOUSTON, TX 77002-5213

Assignment: 22

Reel/Frame:	020551/0740			Pages:	6
		Recorded:	02/22/2008
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/01/2006

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7657376

US20070288169

11827052

Correspondence name and address
	JILL A. MCWHIRTER
	KING & SPALDING LLP
	SUITE 4000
	1100 LOUISIANA
	HOUSTON, TX 77002-5213

Assignment: 23

Reel/Frame:	018274/0009			Pages:	3
		Recorded:	09/08/2006
Attorney Dkt #:	08876.105045
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/06/2006

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY, SUITE 1800

HOUSTION, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7513338

US20070056811

11517920

Correspondence name and address
	JAMES M. HANNON, ESQ.
	KING & SPALDING LLP
	SUITE 4000, 1100 LOUISIANA
	HOUSTON, TX 77002-5213

Assignment: 24

Reel/Frame:	018292/0074			Pages:	3
		Recorded:	09/08/2006
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/06/2006

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY, SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7519475

US20070089878

11517919

Correspondence name and address
	JAMES M. HANNON, ESQ.
	KING & SPALDING LLP
	SUITE 4000, 1100 LOUISIANA
	HOUSTON, TX 77002-5213

Assignment: 25

Reel/Frame:	018293/0495			Pages:	3
		Recorded:	09/11/2006
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/08/2006

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY, SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

NONE

US20070056727

11518701

Correspondence name and address
	JAMES M. HANNON, ESQ.
	KING & SPALDING LLP
	SUITE 4000, 1100 LOUISIANA
	HOUSTON, TX 77002-5213

Assignment: 26

Reel/Frame:	018625/0368			Pages:	3
		Recorded:	12/12/2006
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

09/08/2006

Assignee

KEY ENERGY SERVICES, INC.

MCKINNEY ST.

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7519508

US20070067107

11516153

Correspondence name and address
	KING & SPALDING, LLP
	1100 LOUISIANA ST.
	STE. 4000
	HOUSTON, TX 77002-5213

Assignment: 27

Reel/Frame:	019315/0776			Pages:	13
		Recorded:	05/18/2007
Attorney Dkt #:	08876
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M

Exec Dt:

05/14/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY

SUITE 1800

HOUSTON, TEXAS 77010

Properties

Pat #

Pub #

Intl #

App #

Pat #

Pub #

Intl #

App #

Pat #

Pub #

Intl #

App #

7588083

US20080035333

11690483

7571054

US20080035334

11690904

7788054

US20070227225

11691163

7518526

US20080037368

11691219

NONE

US20080159970

11961031

Correspondence name and address
	KING & SPALDING LLP
	1100 LOUISIANA
	SUITE 4000 ATTN: JILL MCWHIRTER
	HOUSTON, TX 77002

Assignment: 28

Reel/Frame:	019425/0120			Pages:	7
		Recorded:	06/13/2007
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

05/14/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7672785

US20080035335

11691031

Correspondence name and address
	KINE & SPALDING LLP
	ATTN: JIL A. MCWHIRTER
	1100 LOUISIANA
	SUITE 4000
	HOUSTON, TEXAS 77002

Assignment: 29

Reel/Frame:	019794/0728			Pages:	3
		Recorded:	09/07/2007
Attorney Dkt #:	08876.105057
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

08/21/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7793918

US20090057630

11850391

Correspondence name and address
	KING & SPALDING LLP
	1180 PEACHTREE STREET, NE
	34TH FLOOR/ATTN: JAMES M. HANNON
	ATLANTA, GA 30309-3521

Assignment: 30

Reel/Frame:	019794/0764			Pages:	3
		Recorded:	09/07/2007
Attorney Dkt #:	08876.105058
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

08/21/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7917293

US20090063054

11850398

Correspondence name and address
	KING & SPALDING
	1180 PEACHTREE STREET, NE
	34TH FLOOR/ ATTN: JAMES HANNON
	ATLANTA, GA 30309-3521

Assignment: 31

Reel/Frame:	019794/0786			Pages:	3
		Recorded:	09/07/2007
Attorney Dkt #:	08876.105060
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

NEWMAN, FREDERIC M.

Exec Dt:

08/21/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

7631563

US20090056467

11850405

Correspondence name and address
	KING & SPALDING LLP
	1180 PEACHTREET STREET, NE
	34TH FLOOR/ATTN: JAMES M. HANNON
	ATLANTA, GA 30309-3521

Assignment: 32

Reel/Frame:	020325/0209			Pages:	10
		Recorded:	01/07/2008
Attorney Dkt #:	KEY ENERGY SERVICES DEAL
Conveyance:	RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS).

Assignor

LEHMAN COMMERCIAL PAPER, INC.

Exec Dt:

11/28/2007

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Properties

Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #
5297631	NONE		08044187	5439066	NONE		08266011	5711382	NONE		08506955
5988299	NONE		08623041	6079490	NONE		09058477	6168054	NONE		09200490
6377189	NONE		09281864	6212763	NONE		09342564	6276449	NONE		09533511
6253849	NONE		09534599	6209639	NONE		09534601	6213207	NONE		09535239
6241020	NONE		09535555	6164493	NONE		09566166	6374706	NONE		09768551
6728638	US20020156582		09838857	NONE	US20020153134		09839080	NONE	US20020156730		09839103
NONE	US20020156670		09839411	6826492	US20020156591		09839444	6578634	US20030042020		09945924
6758095	US20030188584		10046688	7006009	US20030183382		10113609	7004456	US20040065874		10263630
6898985	NONE		10397796	NONE	US20040226712		10437673	7064677	US20030196798		10440633
NONE	US20040162658		10720594	7221155	US20040196032		10760650	7029422	US20040192507		10778835
7228899	US20040188088		10778846	7226037	US20060163545		10925813	7461830	US20050114001		10942730
7006920	US20050103491		10957309	7114577	US20050199388		11066576	NONE	US20050252279		11087366

Correspondence name and address
	BRACEWELL AND GIULIANI, LLP
	711 LOUISIANA STREET, SUITE 2300
	INTELLECTUAL PROPERTY GROUP
	HOUSTON, TX 77002

Assignment: 33

Reel/Frame:	021118/0518			Pages:	14
		Recorded:	06/19/2008
Attorney Dkt #:	08876.100001
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

HYDRA-WALK, INC.

Exec Dt:

06/18/2008

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Properties

Pat #

Pub #

Intl #

App #

Pat #

Pub #

Intl #

App #

Pat #

Pub #

Intl #

App #

6533519

NONE

09620580

6719515

US20030147726

10389026

6969223

US20040197166

10818575

Correspondence name and address
	KING & SPALDING LLP - JILL A. MCWHIRTER
	1100 LOUISIANA
	SUITE 4000
	HOUSTON, TX 77002

Assignment: 34

Reel/Frame:	021617/0689			Pages:	5
		Recorded:	10/02/2008
Attorney Dkt #:	08876.105020
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

KEY ENERGY SERVICES, LLC

Exec Dt:

10/02/2008

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

6168054

NONE

09200490

Correspondence name and address
	KING & SPALDING LLP, JILL A. MCWHIRTER
	1100 LOUISIANA
	SUITE 4000
	HOUSTON, TX 77002

Assignment: 35

Reel/Frame:	021617/0697			Pages:	5
		Recorded:	10/02/2008
Attorney Dkt #:	08876.105021
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignor

KEY ENERGY SERVICES, LLC

Exec Dt:

10/02/2008

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

6164493

NONE

09566166

Correspondence name and address
	KING & SPALDING LLP, JILL MCWHIRTER
	1100 LOUISIANA
	SUITE 4000
	HOUSTON, TX 77002

Assignment: 36

Reel/Frame:	023842/0790			Pages:	6
		Recorded:	01/25/2010
Attorney Dkt #:	08876.105074
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

CONQUERGOOD, STEVE

Exec Dt:

01/19/2010

LORD, DAVID

Exec Dt:

01/19/2010

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

8590401

US20100132180

12627529

Correspondence name and address
	KING & SPALDING LLP
	1100 LOUISIANA STREET
	SUITE 4000, IP DEPARTMENT
	HOUSTON, TX 77002

Assignment: 37

Reel/Frame:	023842/0844			Pages:	6
		Recorded:	01/25/2010
Attorney Dkt #:	08876.105075
Conveyance:	ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).

Assignors

CONQUERGOOD, STEVE

Exec Dt:

01/19/2010

LORD, DAVID

Exec Dt:

01/19/2010

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Property

Pat #

Pub #

Intl #

App #

8280639

US20100138159

12627542

Correspondence name and address
	KING & SPALDING LLP
	1100 LOUISIANA STREET
	SUITE 4000, IP DEPARTMENT
	HOUSTON, TX 77002

Assignment: 38

Reel/Frame:	025084/0958			Pages:	5
		Recorded:	10/05/2010
Attorney Dkt #:	PATTERSON-UTI/11004922
Conveyance:	RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS).

Assignor

BANK OF AMERICA, N.A.

Exec Dt:

09/28/2010

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY STREET

SUITE 1800

HOUSTON, TEXAS 77010

Properties

Pat #

Pub #

Intl #

App #

Pat #

Pub #

Intl #

App #

7066266

US20050230117

10826783

7273104

US20060021753

11161185

Correspondence name and address
	HUYEN LUONG
	1301 MCKINNEY STREET
	FULBRIGHT & JAWORSKI L.L.P.
	HOUSTON, TX 77010

Assignment: 39

Reel/Frame:	026064/0706			Pages:	14
		Recorded:	04/01/2011
Attorney Dkt #:	196006
Conveyance:	RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS).

Assignor

BANK OF AMERICA, N.A.

Exec Dt:

03/31/2011

Assignee

KEY ENERGY SERVICES, INC.

1301 MCKINNEY, SUITE 1800

HOUSTON, TEXAS 77010

Properties

Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #	Pat #	Pub #	Intl #	App #
5297631	NONE		08044187	5439066	NONE		08266011	5711382	NONE		08506955
5988299	NONE		08623041	6079490	NONE		09058477	6168054	NONE		09200490
6377189	NONE		09281864	6212763	NONE		09342564	6276449	NONE		09533511
6253849	NONE		09534599	6209639	NONE		09534601	6213207	NONE		09535239
6241020	NONE		09535555	6164493	NONE		09566166	6533519	NONE		09620580
6374706	NONE		09768551	6728638	US20020156582		09838857	6826492	US20020156591		09839444
6578634	US20030042020		09945924	6758095	US20030188584		10046688	7006009	US20030183382		10113609
7004456	US20040065874		10263630	6898983	US20040089076		10292715	6719515	US20030147726		10389026
7064677	US20030196798		10440633	7221155	US20040196032		10760650	7029422	US20040192507		10778835
7228899	US20040188088		10778846	6969223	US20040197166		10818575	7066266	US20050230117		10826783
7226037	US20060163545		10925813	7461830	US20050114001		10942730	7006920	US20050103491		10957309
7114577	US20050199388		11066576	7273104	US20060021753		11161185	7359801	US20070056746		11516105
7519508	US20070067107		11516153	7519475	US20070089878		11517919	7513338	US20070056811		11517920
7588083	US20080035333		11690483	7571054	US20080035334		11690904	7672785	US20080035335		11691031
7788054	US20070227225		11691163	7518526	US20080037368		11691219	7657376	US20070288169		11827052
7917293	US20090063054		11850398	7631563	US20090056467		11850405	7739918	NONE		12035259
8590401	US20100132180		12627529	8280639	US20100138159		12627542	8332945	US20100313270		12793929

Correspondence name and address
	JEFF BUTLER/ ANDREWS KURTH LLP
	600 TRAVIS, SUITE 4200
	HOUSTON, TX 77002

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