1
Joseph J Stupak Jr: Variable reluctance actuator having position sensing and control. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, April 21, 1987: US04659969 (46 worldwide citation)

A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced ...


2
Todor K Sheiretov, Roger A Post, Carl J Roy, Joseph F Cordera: Constant force actuator. Schlumberger Technology Corporation, Wayne Kanak, Robin Nava, Tim Curington, July 26, 2005: US06920936 (39 worldwide citation)

A substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more force transmitting memb ...


3
Sheiretov Todor K, Post Roger A, Roy Carl J, Cordera F Joseph: Constant force actuator. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, September 17, 2003: EP1344893-A2 (34 worldwide citation)

The invention provides a substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more ...


4
Falk W Doering, Carl J Roy: Constant force actuator. Schlumberger Technology Corporation, Rodney Warfford, David Cate, Jaime Castano, February 26, 2008: US07334642 (25 worldwide citation)

A radially expandable tool is provided that includes a tool body and a radially moveable member coupled to the tool body and in force receiving relation to a constant force actuator. The radially moveable member is movable by the constant force actuator from an closed position to a plurality of radi ...


5
Joseph J Stupak Jr: Method for sensing and controlling the position of a variable reluctance actuator. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, May 12, 1987: US04665348 (23 worldwide citation)

A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced ...


6
Lowell R Hall: System with constant force actuator. Caterpillar Tractor Co, J W Burrows, February 8, 1983: US04372193 (13 worldwide citation)

A control mechanism (48) is provided to controllably maintain a constant force on an actuator (18) and provide fluid flow to a downstream control valve (24) by controlling a pilot differential pressure between first and second ends (38,40) of a pilot operated control valve (14). A two position valve ...


7
Stupak Joseph J Jr: Controlled force variable reluctance actuator.. Synektron, February 26, 1986: EP0172712-A2 (8 worldwide citation)

In a controlled force variable reluctance position-sensing actuator having a moving element operated by a solenoid (84) the current in the solenoid (84) is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced by a Hall effect devic ...


8
Weyman Weems: Constant force spring actuator. Marsh Fischmann & Breyfogle, October 10, 2000: US06129181 (6 worldwide citation)

A constant force actuator transforms applied heat to an applied force on an output device. Strips of shape memory alloy are coiled into spirals and trained to have this configuration as a static state. The shape memory alloy springs are attached to the output device to apply a directional force. Whe ...


9
Terence Kane, Darrell L Miles: Backside integrated circuit die surface finishing technique and tool. International Business Machines Corporation, Kelly M Reynolds, Tiffany L Townsend, DeLio & Peterson, September 14, 2004: US06790125 (6 worldwide citation)

A method for preparing a semiconductor die for analysis comprises providing a semiconductor die having a connector on one side and an opposite, backside surface to be analyzed, providing a polishing pad for polishing the backside surface of a semiconductor die, providing a rotatable spindle for secu ...


10
Doering Falk W, Roy Carl J: Constant force actuator. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, October 17, 2007: EP1845230-A1 (5 worldwide citation)

A radially expandable tool (10) is provided that includes a tool body and a radially moveable member coupled to the tool body (26) and in force receiving relation to a constant force actuator. The radially moveable member is movable by the constant force actuator from an closed position to a plurali ...