US3770523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of thickened slurry explosives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-06-16
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Granted: 1973-11-06
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Expires: 1991-06-16
Abstract
Abstract Improved method for the preparation of thickened slurry explosives wherein a cross-linking agent is fed to the surface of a stream of thickened aqueous slurry explosive to cross-link the thickening agent on the outer layer of the stream. The invention also includes a nozzle adapted to feed a liquid cross-linking agent to a stream of slurry explosive as it emerges through the nozzle discharge port.
Inventors
- 👤 D Biswas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:18
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/08; C06B; C06B45/00; C06B45/12; C06B47/00; C06B47/14; F; F42; F42D; F42D1/00; F42D1/08; F42D1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A method of preparing a slurry explosive which comprises feeding a cross-linking agent only to the surface of a flowing stream of slurry explosive containing a cross-linkable thickening agent whereby the cross-linking agent becomes admixed with the outer layer of the slurry composition and the thickening agent in the outer layer is cross-linked and the outer layer is thereby further thickened.
Claim 2
Dependent Claim
32 words
A method as claimed in claim 2 wherein the cross-linking agent is fed as a plurality of jet streams impinging at radially spaced positions on the surface of the stream of slurry.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 3 wherein at least some of the jets impinge the slurry stream in a non-radial direction, the non-radial jets being inclined to the radius in the same directional sense.
Claim 4
Dependent Claim
61 words
A method as claimed in claim 2 wherein the slurry explosive is fed to a borehole and liquid cross-linking agent is fed to the said slurry stream before the stream is delivered to the borehole so as to allow the outer layer of the slurry stream to become sufficiently cross-linked to resist water penetration before it is delivered to the borehole.
Claim 5
Dependent Claim
52 words
A column of a slurry explosive varying in composition only in the amount of thickening agent in a diametrical cross section of the column and having a circumferential outer layer of the slurry thickened by an added amount of a thickening agent to a greater degree than the remainder of the column.
References Cited (Backward Citations)
CA861828A
Cited
US3235425A
Cited
US3235423A
Cited
US3288658A
Cited
US3523048A
Cited
US3462324A
Cited
US3617401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |