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Patent Assignment Details

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Reel/Frame:	006683/0516			Pages:	37
		Recorded:	09/07/1993
Conveyance:	SECURITY INTEREST (SEE DOCUMENT FOR DETAILS).

Total properties: 20

Patent #:	4040524	Issue Dt:		Application #:	05150331	Filing Dt:
Title:

Patent #:	4077525	Issue Dt:		Application #:	05523677	Filing Dt:
Title:

Patent #:	3976132	Issue Dt:		Application #:	05579415	Filing Dt:
Title:

Patent #:	4053063	Issue Dt:		Application #:	05677956	Filing Dt:
Title:

Patent #:	4077470	Issue Dt:		Application #:	05762907	Filing Dt:
Title:

Patent #:	4091451	Issue Dt:	05/23/1978	Application #:	05791113	Filing Dt:	04/26/1977
Title:	PNEUMATICALLY ACTUATED THREAD PROTECTOR FOR PIPE

Patent #:	4125040	Issue Dt:		Application #:	05838035	Filing Dt:
Title:

Patent #:	4173988	Issue Dt:		Application #:	05876608	Filing Dt:
Title:

Patent #:	4199032	Issue Dt:	04/22/1980	Application #:	05878643	Filing Dt:	02/17/1978
Title:	APPARATUS FOR MEASURING AND CONTROLLING A FORCE

Patent #:	4630688	Issue Dt:	12/23/1986	Application #:	06278438	Filing Dt:	06/24/1981
Title:	POWER SPINNER FOR ROTATING A KELLY JOINT

Patent #:	4433448	Issue Dt:	02/28/1984	Application #:	06419119	Filing Dt:	09/16/1982
Title:	POWER PIPE THREAD CLEANER

Patent #:	4601334	Issue Dt:	07/22/1986	Application #:	06597852	Filing Dt:	04/09/1984
Title:	CONTROL LINE PROTECTOR FOR OIL WELL TUBING STRING

Patent #:	4684314	Issue Dt:	08/04/1987	Application #:	06654199	Filing Dt:	09/24/1984
Title:	PIPE HANDLING APPARATUS

Patent #:	4711301	Issue Dt:	12/08/1987	Application #:	06773410	Filing Dt:	09/05/1985
Title:	VALVE ASSEMBLY FOR INFLATABLE PACKER

Patent #:	5167173	Issue Dt:	12/01/1992	Application #:	07805004	Filing Dt:	12/11/1991
Title:	TONG

Patent #:	5161438	Issue Dt:	11/10/1992	Application #:	07805014	Filing Dt:	12/11/1991
Title:	POWER TONG

Patent #:	5159860	Issue Dt:	11/03/1992	Application #:	07805090	Filing Dt:	12/11/1991
Title:	ROTARY FOR A POWER TONG

Patent #:	5255559	Issue Dt:	10/26/1993	Application #:	07860740	Filing Dt:	03/25/1992
Title:	APPARATUS FOR TESTING THE GAS-TIGHTNESS OF A JOINT BETWEEN HOLLOW MEMBERS

Patent #:	5238062	Issue Dt:	08/24/1993	Application #:	07871642	Filing Dt:	04/21/1992
Title:	CENTRALIZER FOR CENTRING DRILLING AND CASING PIPES AND CENTRALIZING ARRANGEMENT INCLUDING SAID CENTRALIZER

Patent #:	5261488	Issue Dt:	11/16/1993	Application #:	07910135	Filing Dt:	08/06/1992
Title:	CENTRALIZERS FOR OIL WELL CASINGS

Assignor

Exec Dt:

03/31/1993

Assignee

712 MAIN ST.

HOUSTON, TEXAS 77002

Correspondence name and address
	MICHAEL WILSON
	BAKER & BOTTS, L.L.P.
	ONE SHELL PLAZA
	910 LOUISIANA
	HOUSTON, TX 77002

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