Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Reexamination Certificate
2011-08-23
2011-08-23
Dang, Hoang (Department: 3672)
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
C175S004540
Reexamination Certificate
active
08002026
ABSTRACT:
Electronic time delay apparatuses and methods of use are disclosed. An explosive or propellant system, which may be configured as a well perforating system includes an electronic time delay assembly comprising an input subassembly, an electronic time delay circuit, and an output subassembly. The input subassembly is activated by an external stimulus, wherein an element is displaced to activate an electronic time delay circuit. The electronic time delay circuit comprises a time delay device coupled with a voltage firing circuit. The electronic time delay circuit counts a time delay, and, upon completion, raises a voltage until a threshold firing voltage is exceeded. Upon exceeding the threshold firing voltage, a voltage trigger switch will break down to transfer energy to an electric initiator to initiate an explosive booster within the output subassembly. The explosive booster provides a detonation output to initiate the next element explosive or propellant element, such as an array of shaped charges in the well perforating system.
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Partial PCT International Search Report for International Application No. PCT/US2007/082641, mailed Jun. 20, 2008.
Arrell, Jr. John A.
Borja Ronald S.
Prinz Francois X.
Slade William J.
Alliant Techsystems Inc.
Dang Hoang
TraskBritt
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