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| Number | Title | Issue Date |
| 7874250 | Nano-based devices for use in a wellbore An apparatus includes a component for use in a wellbore, and a nano-based device for activating the component. ... | 01/25/2011 |
| 7640857 | Protective electrically conductive layer covering a reactive layer to protect the reactive layer from electrical discharge A tool for use in a wellbore has an activation assembly, which has a support structure and a reactive layer on the support structure. The reactive layer is formed of a pyrotechnic material. The activation assembly also includes an electrically conductive protective ... | 01/05/2010 |
| 7409911 | Propellant for fracturing wells An apparatus for fracturing wells employs a propellant charge and an ignition cord wrapped around the outer surface of the propellant charge to rapidly ignite the outer surface of the propellant charge. ... | 08/12/2008 |
| 7146913 | Shaped charge tubing cutter A shaped charge detonation booster comprises a tubular wall body of substantially constant outside diameter for enclosing an axial primer path that terminates with an enlarged main cavity volume. Preferably, the main cavity is positioned within the juncture plane of... | 12/12/2006 |
| 7117797 | Pyrotechnic charge structure A pyrotechnic charge structure, in particular for use as propellant in a rocket motor, is disclosed. The charge structure has a predetermined longitudinal extension and cross sectional area adapted to the intended purpose. The pyrotechnic charge structure (1; 2; ... | 10/10/2006 |
| 7069862 | Handheld tool for breaking up rock A tool (12) has a body (14) with a barrel (18) having opposing threaded and fitted openings (30 and 28). An actuator pin tube (26), for slidably engaging an actuator pin (38) having a tip (40) opposing a retent... | 07/04/2006 |
| 6913661 | Ammonium nitrate propellants and methods for preparing the same The present invention is directed to an age-stabilized and/or strengthened ammonium nitrate propellant composition wherein the strengthening agent is selected from the group consisting of azodicarbonamide, dicyandiamide, oxamide and mixtures thereof and wherein the ... | 07/05/2005 |
| 6901865 | Primer casing and method of charging a blasthole Primer casing (1) comprising sleeve portion (5) and leading portion (5a), wherein sleeve portion (5) includes tabs (6) to retain primer (11) and blasthole engagement means (2), and wherein leading portion (5... | 06/07/2005 |
| 6739265 | Explosive device with assembled segments and related methods A segmented explosive device capable of producing a shock wave front upon being exploded by a detonation impulse generated by a selectively operable control device and communicated to the explosive device by a transmission line coupled between the control device and... | 05/25/2004 |
| 6722251 | Method for loading a continuous explosive charge assembly in an elongated cavity A method and apparatus for placement of continuous pre-split, gel explosive in an elongated borehole or cavity. An anchor is attached to one end of a selected length of continuous gel explosive. A suitable anchor is a flexible, plastic “pilgrim's hat” with a hol... | 04/20/2004 |
| 6675896 | Detonation transfer subassembly and method for use of same A detonation transfer subassembly for coupling two detonation activated tools in a work sting such that the work string may be severed between the two detonation activated tools without risk of a detonation. The detonation transfer subassembly comprises f... | 01/13/2004 |
| 6666140 | Ignition device for pyrotechnic microcharges A device for igniting a solid pyrotechnic charge, including a conducting track, wherein the track consists of a conducting fluid deposited at least partially on the pyrotechnic charge, the pyrotechnic charge is deposited on a solid support and covers an e... | 12/23/2003 |
| 6622627 | Actuator apparatus Actuator apparatus comprising an actuator including an at least partially hollow housing, a cap element removably mountable on the actuator, and a coil of electrical wire disposed inside the housing, a first portion of the coil being arranged for electric... | 09/23/2003 |
| 6497180 | Electric actuated explosion detonator An electric actuated explosion detonator for use to detonate a confined explosive charge capable of being detonated by heat and/or shock, including an electrical resistor positioned in engagement with the confined explosive charge, the resistor having two... | 12/24/2002 |
| 6283032 | Projectile with controlled decomposition and integrated charge in the area of the effective mass A smoke-generating projectile has a decomposable effective mass, the mass including a quick-burning deception component for generating spontaneous smoke, and a slow-burning concealment component for generating persistent smoke. The projectile includes an ... | 09/04/2001 |
| 6213212 | Spherical stemming plug and method of use A method of stemming a borehole (6) includes the steps of placing a first layer (16) of stemming in the borehole, placing a spherical body (20) in the borehole on top of the layer (16), the body being relatively incompressible and a diameter slightly smal... | 04/10/2001 |
| 6082264 | Connectors for wired networks for detonators There is disclosed and claimed a wired network of electrically operable detonators. The network includes a plurality of wired detonator assemblies each including a detonator. The wired assemblies being connected into the network by connectors 10 each incl... | 07/04/2000 |
| 5763816 | Explosive primer An explosive primer designed for use with a fuse cord and an initiating device. The primer consists of a container, which holds the explosive, and a cap received on the open end of the container. The container has two lateral opposing cord tunnels which r... | 06/09/1998 |
| 5661256 | Slider member for booster explosive charges A slider (36) has a base fixture (40) and a shielding tube (42). The slider (36) is used to operably couple a detonator (44) to a detonating cord (62) that passes through a booster device (10), i.e., to prevent the detonating cord (62) from directly initi... | 08/26/1997 |
| 5596164 | Electric detonator and lead connector assembly A detonator assembly wherein the electrical leads are attached to an electrical connector which maintains the ends of the leads in non-conductive, waterproof condition and which permits the leads to be spliced to another pair of electric leads without any... | 01/21/1997 |
| 5524547 | Signal tube and detonator cord connector The present invention is directed to an improved connector comprising a first and second holding means for pressure fitting a detonating cord and shock tube in a substantially orthogonal pressure fitting relationship.... | 06/11/1996 |
| 5392713 | Shock insensitive initiating devices The invention relates to a shock insensitive explosive train initiating dce including a thin elongated metal casing containing a quantity of hydrated metal picrate therein, a thermite igniter composition disposed adjacent to the hydrated metal picrate ch... | 02/28/1995 |
| 5331896 | Process for visualization of a detonation wave Steps of a process for visualization of a detonation wave involve examini measuring, and confirming a fuel-air explosion by using a ground-based fuel bottle oriented horizontally whereby the explosive dissemination creates a fuel-air cloud with its diame... | 07/26/1994 |
| 5140908 | Liquid explosive with initiator An explosive composition of matter comprising nitromethane and picric acid. n a preferred embodiment of the invention commercially available picric acid containing up to 10 percent water by weight is added to the nitromethane up to saturation at room tempe... | 08/25/1992 |
| 5071496 | Low level blasting composition A blasting agent is disclosed for use in a borehole having a pressure resistant closure. The blasting agent is used in combination with a primary initiating system comprised of a detonator and an initiator for the detonator. The blasting agent is preferab... | 12/10/1991 |
| 5062365 | Rapid burning propellent charge for automobile air bag inflators, rocket motors, and igniters therefor A rapid burning propellant charge for applications including igniters, launch eject motors, and gas generators for automobile air bags. The propellant charge comprises a reticulated substrate having a quantity of interconnected ligaments and a coating of ... | 11/05/1991 |
| 5060573 | Detonator assembly A metal detonator housing has a central opening extending therethrough between upper and lower ends and a detonator located in the opening at the lower end. Two leads are conencted to the detonator for causing the detonator to explode upon the application... | 10/29/1991 |
| 5005641 | Gas generator with improved ignition assembly A gas generating type tool includes a propellant charge having an axially extending passage receiving therein an ignition tube containing a quantity of easily ignited, fast burning powder. The propellant and ignition tube are separately handled and/or tra... | 04/09/1991 |
| 4982662 | Shaped primer A primer for explosives comprises a shaped charge of detonating material for use with an initiator such as a detonator or fuse cord which penetrates into the charge at least about as far as its center of mass, wherein said primer has a cavity for receivin... | 01/08/1991 |
| 4939993 | Detonator A detonator 10 includes an elongate tubular member 12 which defines a longitudinally extending passage 14. A pair of base charges 16 and 20 are located in the passage 14. A primary charge 18 which is substantially disc-shaped is located in the passage 14 ... | 07/10/1990 |
| 4872408 | Polymeric film-enveloped explosive cartridges and their manufacture and use An improved plastic film cartridge for flowable explosives is provided. The cartridge comprises a recessed or indented end configuration which recess can be enlarged to provide a locating and retaining pocket for a blasting cap without any penetration of ... | 10/10/1989 |
| 4852496 | Charging and detonation device for submunition An environmental charging and detonation system for submunitions has an arnator in which a firing pin or rotor shaft is used for safing and arming, stab detonation, as well as the rotor for the alternator. A ram air actuated ribbon is deployed during sub... | 08/01/1989 |
| 4841856 | Pyrotechnical delay elements for delayed-action fuse and uses thereof A miniaturized delay element was developed for use in medium-and large caliber weapon systems and is realized in a metallic cartridge made of a copper-free light metal. By including a metallic combustible, an oxidant consisting of a halogen-containing hig... | 06/27/1989 |
| 4821646 | Delay initiator for blasting A novel initiator (blasting cap) for explosives is provided. The initiator, which may be electric or non-electric, comprises a tubular metal shell having within a base charge, a delay train, a priming charge and an ignition means. Interposed between the d... | 04/18/1989 |
| 4817530 | Delay detonator A nonelectric delay detonator has, in a casing, a secondary charge as well as a delay device. The delay detonator is initiated by an ignition transfer hose extending into the casing. A partition is arranged between a hose end and the delay device. Ignitio... | 04/04/1989 |
| 4799428 | Explosive primer unit for instantaneous initiation by low-energy detonating cord An explosive primer unit adapted to be initiated instantaneously by low energy detonating cord when the unit comprises an explosive primer and an explosive coupler which operatively joins the low energy detonating cord to the primer.... | 01/24/1989 |
| 4796533 | Primer assembly A primer assembly for use in the non-electric initiation of cap-insensitive explosives, especially of deck-loaded explosive charges by means of a single downline of low-energy detonating cord (LEDC), includes a percussion-actuated detonator seated in a ca... | 01/10/1989 |
| 4765246 | Detonator and a charge adapted thereto A detonator for non-electric detonation systems for blasting charges intended to be initiated by a detonating fuse includes a passage provided in the body of the detonator for passing a detonating fuse through the passage. The detonator includes a convent... | 08/23/1988 |
| 4754704 | Propellant charge for the reduction of base eddying A propellant charge for the reduction of base eddying or drag of a shell 12 with a centrally disposed ignition conduit and an ignition device for the charge disposed in the conduit. To improve the ignition readiness of the propellant charge, the inner sur... | 07/05/1988 |
| 4730560 | Combination blasting signal transmission tube connector and delay assembly A combination signal transmission tube connector and delay assembly having a housing; means on the housing for engaging at least one signal transmission tube; means on the housing for cutting the transmission tube to expose at least two transmission tube ... | 03/15/1988 |
