Patent US3617401A successfully refreshed from Google Patents.
US3617401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Column of blasting agent of controlled density
Assignee: Ireco Inc
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Filing: 1968-10-01
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Granted: 1971-11-02
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Expires: 1988-10-01
Abstract
Abstract In order to control slurry density in deep holes, varying amounts of aerating or gasifying agent, preferably a generated essentially insoluble gas, are added. Hydrogen peroxide may be decomposed to produce oxygen, using catalyst such as potassium iodide or manganese dioxide, etc. Gas generating material and catalyst may be added variably, e.g. to produce gas in progressively decreasing proportions as slurry is pumped, starting at the bottom and rising in a borehole, to offset the compressive effect of the column weight thus keeping the whole slurry column at density low enough for reliable detonation.
Inventors
- 👤 Kay S Mortensen
- 👤 Lex L Udy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:36
CPC Classifications
C; C06; C06B; C06B47/00; C06B47/14; C06B23/00; C06B23/002; C06B23/004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A blasting charge according to claim 1 wherein proportions of said aerating gas decrease from the bottom towards the top of the column.
Claim 2
Dependent Claim
16 words
A blasting charge according to claim 1 which contains decomposible hydrogen peroxide as an aerating agent.
Claim 3
Dependent Claim
37 words
A charge according to claim 1 which contains hydrogen peroxide as an aerating agent and a small proportion of hydrogen peroxide-decomposing catalyst, said catalyst being uniformly distributed and said hydrogen peroxide being nonuniformly distributed throughout said charge.
Claim 4
Dependent Claim
30 words
A blasting charge according to claim 1 which contains sufficient aerating gas to keep its bulk density in all parts of the column below about 1.4 grams per cubic centimeter.
Claim 5
Dependent Claim
27 words
A blasting charge according to claim 1 which contains a substantially uniformly decreasing proportion of aerating gas from the bottom of the explosive column to the top.
Claim 6
Dependent Claim
11 words
A charge according to claim 1 wherein the gas is oxygen.
Claim 7
Dependent Claim
32 words
A charge according to claim 1 which includes a gas-generating substance unequally distributed with a high concentration in the lower part of the charge and a lesser concentration in the upper part.
Claim 8
Dependent Claim
40 words
A charge according to claim 1 which comprises a substantially uniformly distributed small concentration of gas-producing agent sufficient to insure detonation at the bottom of a deep column of slurry and more than adequate for insured detonation at higher levels.
References Cited (Backward Citations)
US3470041A
Cited
US3288658A
Cited
US3288661A
Cited
US3369945A
Cited
US3390028A
Cited
US3390032A
Cited
US3390030A
Cited
US3382117A
Cited
US3453158A
Cited
US3447978A
Cited
US3449181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |