US3769874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of pumping explosive slurry
Assignee: Orica Ltd
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Filing: 1972-07-24
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Granted: 1973-11-06
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Expires: 1992-07-24
Abstract
Abstract The invention is to a method of filling bore-holes by pumping an explosive slurry by a primary pump through a hose more than 50 ft. in length to a secondary unit in a restricted underground space. From the secondary unit the explosive slurry is pumped through a hose inserted in a borehole and an additive is pumped into the explosive slurry. Control devices for controlling the flow of explosive slurry are provided.
Inventors
- 👤 D Williams
- 👤 A Wisinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:00
CPC Classifications
C; C06; C06B; C06B21/00; F; F42; F42D; F42D1/00; F42D1/08; F42D1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A method of filling boreholes from a restricted underground space which method comprises pumping an explosive slurry from a bulk tank by means of a primary pump through a hose more than 50 ft. in length from a point outside the restricted underground space to a secondary unit situated in the restricted underground space said secondary unit comprising a slurry hopper, a secondary pump, an additive tank and an additive pump; pumping the explosive slurry from the secondary slurry hopper by means of the secondary pump through a hose inserted into the borehole; pumping an additive from the additive tank by means of the additive pump into the slurry at, or after the secondary hopper; the operation of the primary pump being controlled automatically by the level of the slurry hopper of the secondary unit, the secondary unit being controlled by a remote control device from a point adjacent to the opening of the borehole; and said secondary unit may be readily dismantled into readily portable sections and readily reassembled in a restricted area.
Claim 2
Independent Claim
174 words
A method of filling boreholes from a restricted underground space which method comprises pumping an explosive slurry from a bulk tank by means of a primary pump through a hose more than 50 ft. in length from a point outside the restricted underground space to a secondary unit situated in the restricted underground space said secondary unit comprising a slurry hopper, a secondary pump, an additive tank and an additive pump; pumping the explosive slurry from the secondary slurry hopper by means of the secondary pump through a hose inserted into the borehole; pumping an additive from the additive tank by means of the additive pump into the slurry at, or after the secondary hopper; the operation of the primary pump being controlled automatically by the level of the slurry hopper of the secondary unit, the secondary unit being controlled by a remote control device from a point adjacent to the opening of the borehole; and said secondary unit may be readily dismantled into readily portable sections and readily reassembled in a restricted area.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein the additive is pumped through a hose to the end of the explosive slurry hose in the borehole.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein the explosive slurry hose encases the additive hose and is terminated by an interfacial surface generator mixer.
Claim 5
Dependent Claim
20 words
A method according to claim 1 wherein there is a detonation trap between the bulk tank and the secondary unit.
References Cited (Backward Citations)
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 |