Dyno Nobel Inc.

Joseph W Twarog, Jr

Tyson James Plitt

Ernest L Gladden

John Childs

Mark R Dorman

Raymond T Overstrom

John C Campbell, Jr

James Bayliss

Kim Chi Ho

A gas-impermeable sealer element () for a detonator or other explosive initiation device includes a non-reactive sleeve () having a channel () formed therein. A reactive material strip () is sealed within the channel for transmission of an explosive's initiation signal through the sealer element (), either alone or in cooperation with transfer charges located at the input and/or output end of the non-reactive sleeve (). The reactive material strip () comprises a reactive metal wire or other substrate () having on one or both sides thereof a layer of reactive material (), either reactive metal foils which react exothermically when ignited, or a deposited fuel-oxidizer reactive material. The reactive materials, upon being energized, react exothermically in the absence of atmospheric oxygen or other extraneous oxidizer and so may be encapsulated, sealed or otherwise isolated from the atmosphere in use.

Sealer elements, detonators containing the same, and methods of making

A timing element for an initiator is made from a reactive polymeric material such as, e.g., a glycidyl azide polymer. The reactive polymeric material may include pulverulent oxidizer additives, such as ammonium, perchlorate and/or ferric oxide. The oxidizer additives are used to increase the rate of reaction and the output spark of the polymer material. The timing element serves to delay the travel of an initiation signal between an input, such as a signal transmission input line, and an explosive output charge, for a predetermined period of time, usually about 5 to about 10,000 milliseconds, e.g., about 9 to about 9600 milliseconds.

Energetic linear timing element

A signal transmission tube may be made by disposing a reactive polymeric material within a confinement tube and leaving a portion of the tube interior unoccupied. The tube may be formed by disposing a layer of paint comprising the reactive polymeric material on the interior surface of the confinement tube, extruding the confinement tube over an elongate rod that comprises the reactive polymeric material. The rod preferably has a high surface area configuration, e.g., the rod may comprise a longitudinal bore therethrough or may be star-shaped, cross-shaped, etc. Alternatively, the signal transmission tube may be made from the reactive polymeric material. Optionally, a sheath may be extruded over the tubular reactive polymeric material. In various embodiments, the confinement tube or sheath may be configured to be fractured or substantially consumed by the reaction of the reactive polymeric material. Optionally, the reactive polymeric material may comprise a glycidyl azide polymer.

Tubular signal transmission device and method of manufacture

Growing community of inventors

Barkhamsted, CT, United States of America

Joseph W Twarog, Jr