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| Number | Title | Issue Date |
| 8136449 | Explosive powder plug and method of using the same An inexpensive bullet-shaped plug is shown for use in a blasting hole containing water in the bottom thereof, which plug permits dry powder to be used above the waterline rather than more expensive wet powder. After the blasting holes are drilled, if water accumulat... | 03/20/2012 |
| 8091478 | System and method for electronically discriminating a target A target discrimination system monitors an acceleration switch signal to determine an impact of a projectile on a target. During a sample period of approximately 1.0 milliseconds, the system repeatedly samples the acceleration switch signal, compares the sampled acc... | 01/10/2012 |
| 7363860 | Non-explosive two component initiator Methods and apparatus for detonating explosives or igniting flammables are disclosed. According to some embodiments of the invention, initiators include an initiating component holding an exploding bridgewire (EBW) or an exploding foil initiator (EFI) and a flammabl... | 04/29/2008 |
| 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 |
| 6502631 | Reinforced borehole plugs Reinforced borehole plugs useful in the presplitting and blast removal of earth formations, the improvements provided by the invention comprising inflatable devices intended to support stemming, explosives and the like at suspended locations within a bore... | 01/07/2003 |
| 6363828 | Shock driven projectile device This invention relates to a device for accurately delivering a ballistically stable, monolothic projectile at repeatable velocities to a specified target using an explosive event without causing deformation or fragmentation of the projectile. In its most ... | 04/02/2002 |
| 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 |
| 4947751 | Multi-directional initiator for explosives A method of blasting cap-sensitive, non-nitroglycerine-sensitized explosives and an initiating assembly for use in the method are provided. The method comprises initiating a column of the explosives by directing two radial/forward shock forces from an ini... | 08/14/1990 |
| 4587904 | Debris free plug assembly for heat exchange tubes An explosive activated assembly for repairing a heat exchange tube in which a grooved metal casing is inserted into the tube to be repaired and has a plurality of projections extending from the outer surface thereof. A force-transmitting member extends wi... | 05/13/1986 |
| 4449754 | Device for breaking monolithic structures by pulsewise liquid pressure A device for breaking monolithic structures or pulsating by inducing pressure in a liquid filling a pre-drilled hole in the monolithic structure to be shattered comprises a tubular housing having a cavity for accommodating an explosive charge. Provided in... | 05/22/1984 |
| 4432268 | Detonation cut-off device A passive detonation cut-off device for a solid line of explosives operates by directionally controlling the detonation pressure of an accidental detonation wave of an explosives line and by using this directionally controlled detonation pressure to sever... | 02/21/1984 |
| 4347790 | Explosive plug for blocking tubes An explosive plug for blocking tubes comprises a tubular metal body closed at one end by a solid head and having at the other end a surface-contact region containing at least two spaced apart charges actuable by a detonator. The metal body when placed in ... | 09/07/1982 |
| 4133247 | Carrier for explosive primer and method of using same A method of charging a borehole with at least first and second separate sections of explosive material, which method comprises the steps of providing a detonating cord extending into the borehole, providing a first primer on a first carrier having a time ... | 01/09/1979 |
| 4040330 | Method of charging drill holes and means for carrying out the method A method and device for charging a drill hole with explosives including a stocking of thin flexible material folded up to form a bellows with an axial duct closed at one end, a charging hose inserted into the duct on which the bellows slides, and a protec... | 08/09/1977 |
| 4036100 | Apparatus and method for loading fluent explosives in upwardly extending boreholes Apparatus for loading an upwardly extending borehole with a fluent explosive, including a tubular member extending along a portion of its length into the borehole, a conduit axially extending into the external open end section of the tubular member to a p... | 07/19/1977 |
| 3974656 | Method and apparatus for excluding water or other material from a blast hole in rock A method and apparatus for excluding water and other materials from a blast hole in rock for extended periods of time by inserting an expandable sleeve into the hole; sealing the sleeve with a closure means including a plug disposed in the sleeve, which c... | 08/17/1976 |
| 3952656 | Device and process A stemming device for holes which device comprises at least one layer of a esilient material capable of forming a seal in conjunction with the wall of a hole, the seal being characterized in that it prevents, minimizes or substantially retards the flow of ... | 04/27/1976 |
