Ammunition and explosives – Igniting devices and systems – Propellant ignitors
Reexamination Certificate
2005-08-09
2005-08-09
Bagnell, David (Department: 3672)
Ammunition and explosives
Igniting devices and systems
Propellant ignitors
C166S297000, C166S055000, C166S063000
Reexamination Certificate
active
06925937
ABSTRACT:
An ignition device for a downhole tool includes a body with a cavity, a thermite material and a resistive element within the cavity. The resistive element, which is heated to the high temperature needed for ignition of the thermite material, has a non-galvanic outer surface at the ignition temperature. A large amount of electrical power is required to reach the ignition temperature, making the device safe and unlikely to accidentally ignite. The device has an electrical connector that is located within a sealed chamber when downhole.
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Bagnell David
Mantooth Geoffrey A.
Smith Matthew J.
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