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US3683809A Expired / Lapsed US ⏱️ 0.0 years remaining

Detonator fuse initiated aqueous slurry explosive system

Assignee: Ireco Inc
•
Filing: 1970-06-30
•
Granted: 1972-08-15
•
Expires: 1990-06-30
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Abstract

Abstract A detonator cord-initiated slurry type inorganic oxidizer salt explosive system is provided, in which the slurry explosive charge is detonatable without substantial loss in detonation energy encountered heretofore, and which comprises a detonator cord having alternate high and low energy loadings extending in lengthwise contact with a mass of the explosive; a booster type detonator for the explosive within the mass and adjacent each high energy core section and detonatable by detonation energy transmitted from the adjacent high energy section; each high energy section being detonatable by detonation energy transmitted from an adjacent low energy core section which has a loading not exceeding about 18 grains PETN (or equivalent) per foot, and thereby laterally transmits insufficient detonation energy to the main charge to cause substantial lowering of the detonation energy thereof. The high energy section loading is at least 25 grains PETN (or equivalent) per foot. In one embodiment, the high energy section loading can be at least 200 grains PETN (or equivalent) per foot to constitute an integral unit of high energy section and adjacent booster without need for a separately disposed booster.

Inventors

  • 👤 William C Burkle

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 21:53
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/06

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 17 words
In an explosive system of claim 1 a columnar gelled aqueous slurry type explosive as said mass.
Claim 2
Dependent Claim 20 words
An explosive system of claim 2 wherein said slurry explosive is free from any ingredients which are, per se, explosives.
Claim 3
Dependent Claim 17 words
An explosive system of claim 2 wherein said slurry explosive contains dispersed gas bubbles to facilitate sensitivity.
Claim 4
Dependent Claim 53 words
An explosive system of claim 2 wherein the core loading of each high energy core section is up to about 200 grains PETN (or equivalent) per foot; and the core loading of each said low energy section is within the range of from about 2 to 12 grains PETN (or equivalent) per foot.
Claim 5
Dependent Claim 20 words
An explosive system of claim 2 wherein said detonator cord extends from said mass to an external initiator source therefor.
Claim 6
Dependent Claim 43 words
In an explosive system of claim 2 a plurality of said boosters spaced apart along the length of said columnar mass, each said booster containing a passageway extending therethrough, and a high energy section of said detonator cord disposed within each said passageway.
Claim 7
Dependent Claim 23 words
An explosive system of claim 2 containing only one booster, and said booster positioned within said columnar mass at substantially one end thereof.
Claim 8
Dependent Claim 13 words
A system of claim 7 wherein said boosters are spaced apart substantially equidistantly.
Claim 9
Dependent Claim 38 words
A system of claim 7 wherein the length of said columnar mass is in the order of from about 2 to 50 feet and said boosters are successively spaced apart a distance of from 5 to 20 feet.
Claim 10
Dependent Claim 33 words
An explosive system of claim 10 wherein said explosive contains a sensitizing proportion of dispersed gas bubbles, and guar gum in cross-linked form to provide a resulting column of gelled aqueous slurry explosive.
Claim 11
Dependent Claim 41 words
An explosive system of claim 1 wherein at least one booster and high energy core section adjacent thereto constitutes, as an integral unit, said high energy section having a core loading of at least 200 grains PETN (or equivalent) per foot.
Claim 12
Dependent Claim 18 words
An explosive system of claim 12 where said core loading is 300-700 grains PETN (or equivalent) per foot.
Claim 13
Dependent Claim 19 words
An explosive system of claim 2 wherein said detonator cord extends within said mass in said lengthwise contact therewith.

References Cited (Backward Citations)

US3236180A Cited
US3212438A Cited
US3241489A Cited
US3390032A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-15 1976-02-14 1976-08-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-15 1980-02-14 1980-08-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-15 1984-02-14 1984-08-15 $7700.00 Window Closed / Lapsed

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