US3810425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blasting with an nh{11 {11 no{11 -{11 nitropropane blasting agent
Assignee: Individual
•
Filing: 1972-12-04
•
Granted: 1974-05-14
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Expires: 1992-12-04
Abstract
Abstract Crushed ammonium nitrate fueled with the proper nitropropane lower alcohol mix is a non cap-sensitive, field-mixable blasting agent that produces two to four times the detonation pressure obtainable with AN/FO, when loaded to densities between 1.10 and 1.55 by use of a simple over-hole mechanical device.
Inventors
- 👤 J Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:08
CPC Classifications
C; C06; C06B; C06B31/00; C06B31/28; C06B31/32; C06B47/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
The method of claim 1 wherein the explosive comprises ammonium nitrate, 5-9 percent by weight of nitropropane and 5-9 percent by weight of an alkanol containing from 1 to 5 carbon atoms.
Claim 2
Dependent Claim
24 words
The method of claim 1 wherein the explosive comprises crushed ammonium nitrate, 5-9 percent by weight of 2-nitropropane and 5-9 percent by weight methanol.
Claim 3
Dependent Claim
75 words
A method according to claim 1 which further includes the steps of adding the blasting composition to a catching device to form a cohesive compact unit of blasting composition having the shape of the catching device, dropping the blasting composition as a cohesive compact unit so that the unit of blasting composition substantially retains its shape as formed in the catching device during its entire downward flight to its point of rest within the hole.
Claim 4
Dependent Claim
46 words
A method according to claim 4 wherein the compact unit of blasting composition has an elongated tubular shape with a first and second end, said tubular shape having a transverse cross-sectional area at said first end less than the transverse cross-sectional area at said second end.
Claim 5
Dependent Claim
33 words
A method according to claim 5 wherein the compact unit of blasting composition is dropped into the hole so that the second end of the unit is the first end in the hole.
Claim 6
Independent Claim
194 words
A method of blasting comprising: a. adding a blasting agent to a compacting device wherein said compacting device comprises a tubular member having a top end and a bottom end and having an inside diameter along the entire length of said member, wherein the inside diameter at the top of said member is smaller than the inside diameter at the bottom of said member and wherein the bottom end of said member has attached thereto a gate which has means operatively attached thereto for moving the gate to (1) a closed position wherein the bottom end of the tubular member is substantially completely covered by said gate and blocked from passage of blasting composition therethrough and (2) an open position wherein the bottom end of the tubular member is substantially completely unobstructed by said gate for free passage of blasting composition through said bottom end, b. opening the gate of said compacting device and thereby causing the explosive contents of said compacting device to flow as a single compact unit from said compacting device into a hole wherein the in-hole density of said explosive is 1.10 to 1.55 gm/cc., c. detonating the blasting composition.
Claim 7
Dependent Claim
32 words
The method of claim 4 wherein the explosive comprises ammonium nitrate, 5-9 percent by weight of nitropropane and 5-9 percent by weight of an alkanol containing from 1 to 5 carbon atoms.
Claim 8
Dependent Claim
24 words
The method of claim 4 wherein the explosive comprises crushed ammonium nitrate, 5-9 percent by weight of 2-nitropropane and 5-9 percent by weight methanol.
Claim 9
Dependent Claim
22 words
The method of claim 4 wherein less than 60 percent of the ammonium nitrate has a particle size greater than 20 mesh.
References Cited (Backward Citations)
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US3040615A
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US2966855A
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US3275485A
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US3318741A
Cited
US3718512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |