1
Lemuel T York, Allan S Richardson, Beat Kuttel: Top drive well casing system and method. Canrig Drilling Technology, Baker Botts L, January 20, 2004: US06679333 (116 worldwide citation)

A well casing system is disclosed for the handling and make-up of casing on a drilling rig in conjunction with a top drive is disclosed. The system comprises a top drive, a casing make-up assembly, links, link tilts, and transfer and lifting elevators. The operator can remotely manipulate the elevat ...


2
Lemuel T York, Allan S Richardson, Beat Kuttel: Top drive well casing system. Canrig Drilling Technology, Baker Botts L, July 26, 2005: US06920926 (17 worldwide citation)

A well casing system is disclosed for the handling and make-up of casing on a drilling rig in conjunction with a top drive is disclosed. The system comprises a top drive, a casing make-up assembly, links, link tilts, and transfer and lifting elevators. The operator can remotely manipulate the elevat ...


3
Lemuel T York, Allan S Richardson, Beat Kuttel: Valve actuator. Baker Botts L, January 11, 2005: US06840493 (10 worldwide citation)

A valve actuator is provided in which a complementary set of pinions, each driven by a pair of racks, are located on opposite sides of the valve to be actuated. The racks are part of an annular bearing assembly and are coupled to one another through a hydraulic cylinder or some other displacement de ...


4
Lemuel T York, Allan S Richardson, Beat Kuttel: Top drive well casing system and method. Canrig Drilling Technology, Roger Fulghum, Baker Botts, December 23, 2004: US20040256110-A1

A well casing system is disclosed for the handling and make-up of casing on a drilling rig in conjunction with a top drive is disclosed. The system comprises a top drive, a casing make-up assembly, links, link tilts, and transfer and lifting elevators. The operator can remotely manipulate the elevat ...


5
Lemuel T York, Allan S Richardson, Beat Kuttel: Valve actuator. Canrig Drilling Technology, Roger Fulghum, Baker Botts, October 9, 2003: US20030189184-A1

A valve actuator is provided in which a complementary set of pinions, each driven by a pair of racks, are located on opposite sides of the valve to be actuated. The racks are part of an annular bearing assembly and are coupled to one another through a hydraulic cylinder or some other displacement de ...