US4528049A
Expired / Lapsed
US
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Seismic explosive composition
Assignee: Mining Services International Corp
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Filing: 1984-07-09
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Granted: 1985-07-09
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Expires: 2004-07-09
Abstract
Abstract A dry explosive seismic composition which can be initiated by low grain detonating cord so as to minimize the fire hazards typically associated with seismic testing. Preferred compositions within the scope of the present invention include a sensitizer of Hexamine or a derivative thereof, such as Hexamethylenetetramine Mononitrate. The compositions of the present invention not only reduce the fire hazards associated with using such compositions, but they also resist vaporization of the sensitizer, thereby minimizing the problems associated with handling the compositions.
Inventors
- 👤 Lex L. Udy
- 👤 John T. Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:53
CPC Classifications
C; C06; C06B; C06B31/00; C06B31/02; C06B31/12; C06B31/28; C06B31/32
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; hexamine sensitizer having a percentage composition in the range of from about 5% to about 8% by weight; and finely divided aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord having not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 2
Dependent Claim
97 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; hexamine sensitizer having a percentage composition in the range of from about 5% to about 8% by weight; and finely divided aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord having not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 3
Dependent Claim
27 words
A dry seismic explosive composition as defined in claim 1 further comprising fumed silica having a percentage composition in an amount up to about 0.3% by weight.
Claim 4
Dependent Claim
31 words
A dry seismic explosive composition as defined in claim 1 wherein the percent composition of finely divided aluminum is in the range of from about 0.5 to about 3% by weight.
Claim 5
Dependent Claim
29 words
A dry seismic explosive composition as defined in claim 1 wherein the oxidant is selected from the group consisting of ammonium nitrate, potassium nitrate, sodium nitrate and lead nitrate.
Claim 6
Dependent Claim
48 words
A dry seismic explosive composition as defined in claim 1 wherein the oxidant comprises ammonium nitrate having a percentage composition in the range of from about 70% to about 90% by weight and potassium nitrate having a percentage composition in an amount up to about 20% by weight.
Claim 7
Dependent Claim
25 words
A dry seismic explosive composition as defined in claim 1 wherein the fuel is selected from the group consisting of gilsonite, coal dust and sugar.
Claim 8
Dependent Claim
61 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; and hexamine having a percentage composition of not more than 10%.
Claim 9
Dependent Claim
61 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; and hexamine having a percentage composition of not more than 10%.
Claim 10
Dependent Claim
104 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; a sensitizer in a percentage composition in the range of from about 5% to about 8% by weight, said sensitizer being a derivative of hexamine; and finely divided aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord of not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 11
Dependent Claim
104 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; at least one fuel having a percentage composition in the range of from about 1% to about 3% by weight; a sensitizer in a percentage composition in the range of from about 5% to about 8% by weight, said sensitizer being a derivative of hexamine; and finely divided aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord of not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 12
Dependent Claim
16 words
A dry seismic explosive composition as defined in claim 8 wherein the sensitizer is hexamethylenetetramine mononitrate.
Claim 13
Dependent Claim
110 words
A dry explosive composition consisting essentially of: ammonium nitrate having a concentration in the range of from about 70% to about 90% by weight; potassium nitrate having a concentration up to about 20% by weight; fumed silica having a concentration up to about 0.3% by weight; finely divided aluminum having a concentration in the range of from about 0.5% to about 3% by weight; gilsonite in a concentration in the range of from about 1% to about 3% by weight; and a sensitizer selected from the group consisting of hexamine and hexamethylenetetramine mononitrate, said sensitizer having a concentration in the range of from about 5% to about 8% by weight.
Claim 14
Dependent Claim
110 words
A dry explosive composition consisting essentially of: ammonium nitrate having a concentration in the range of from about 70% to about 90% by weight; potassium nitrate having a concentration up to about 20% by weight; fumed silica having a concentration up to about 0.3% by weight; finely divided aluminum having a concentration in the range of from about 0.5% to about 3% by weight; gilsonite in a concentration in the range of from about 1% to about 3% by weight; and a sensitizer selected from the group consisting of hexamine and hexamethylenetetramine mononitrate, said sensitizer having a concentration in the range of from about 5% to about 8% by weight.
Claim 15
Dependent Claim
75 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; hexamine sensitizer having a percentage composition in the range of from about 5% to about 8% by weight; and aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord having not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 16
Dependent Claim
75 words
A dry seismic explosive composition comprising: an admixture of at least one oxidant having a total percentage composition in the range of from about 70% to about 90% by weight; hexamine sensitizer having a percentage composition in the range of from about 5% to about 8% by weight; and aluminum having a percentage composition sufficient to initiate the explosive composition with a detonating cord having not more than 18 grains of pentaerythritol tetranitrate per foot.
Claim 17
Dependent Claim
31 words
A dry seismic explosive composition as defined in claim 11 wherein the percent composition of aluminum is in the range of from about 0.5 percent to about 6 percent by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |