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US4464989A
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US
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Integral low-energy thermite igniter
Assignee: United States, ENERGY THE, Secretary of, Department of
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Filing: 1983-05-13
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Granted: 1984-08-14
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Expires: 2003-05-13
Abstract
Abstract In a thermite igniter/heat source comprising a container holding an internal igniter load, there is provided the improvement wherein the container consists essentially of consumable consolidated thermite having a low gas output upon combustion, whereby upon ignition, substantially all of the container and said load is consumed with low gas production.
Inventors
- 👤 Albert Gibson
- 👤 Lowell D. Haws
- 👤 Jonathan H. Mohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:04
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/085; C; C06; C06B; C06B21/00; C06B21/0033; C06B21/0041; C06B33/00; C06C; C06C9/00; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/128
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
48 words
In a thermite igniter/heat source comprising a container holding an internal igniter load, the improvement wherein the container consists essentially of consumable consolidated thermite having a low gas output upon combustion, whereby upon ignition, substantially all of the container and said load is consumed with low gas production.
Claim 2
Dependent Claim
48 words
In a thermite igniter/heat source comprising a container holding an internal igniter load, the improvement wherein the container consists essentially of consumable consolidated thermite having a low gas output upon combustion, whereby upon ignition, substantially all of the container and said load is consumed with low gas production.
Claim 3
Dependent Claim
59 words
A thermite igniter/heat source of claim 1, wherein the consolidated thermite is a combination of aluminum metal and MnO 2 , MoO 3 , CuO, Fe 2 O 3 , Fe 3 O 4 , PbO 2 , Cr 2 O 3 , WO 3 , Cu 2 O, Pb 3 O 4 , NiO or a mixture thereof.
Claim 4
Dependent Claim
37 words
A thermite igniter/heat source of claim 1, wherein the consolidated thermite is a combination of aluminum metal and CuO, Fe 2 O 3 , Fe 3 O 4 , Cu 2 O, NiO or a mixture thereof.
Claim 5
Dependent Claim
21 words
A thermite igniter/heat source of claim 1, wherein the consolidated thermite is a combination of aluminum metal and Cu 2 O.
Claim 6
Dependent Claim
30 words
A thermite igniter/heat source of claim 1, wherein the consolidated thermite is a combination of about 11 weight percent of Al and about 89 weight percent of Cu 2 O.
Claim 7
Dependent Claim
18 words
A thermite igniter/heat source of claim 1, wherein the consolidated thermite is prepared by hot pressing thermite powder.
Claim 8
Dependent Claim
18 words
A thermite igniter/heat source of claim 1, wherein the smallest dimension of the container is about 250 mils.
Claim 9
Dependent Claim
18 words
A thermite igniter/heat source of claim 1, wherein the largest dimension of the container is about 4 inches.
Claim 10
Dependent Claim
55 words
A thermite igniter/heat source of claim 1, wherein the container has side walls and a bottom wall and which further comprises, two electrodes passing through the bottom wall into the inside of the container, and a fuse inside the container and in contact with the ends of the two electrodes which are inside the container.
Claim 11
Dependent Claim
25 words
A thermite igniter/heat source of claim 9, wherein the container has cylindrical side walls and wherein the internal igniter load comprises discrete, compositionally distinct zones.
Claim 12
Dependent Claim
55 words
A thermite igniter/heat source of claim 10, wherein said internal igniter load comprises a primer mix in contact with said fuse, a low density thermite mix over said primer mix, a thermal barrier over said low density thermite mix, a burnable barrier over said thermal barrier, and a consolidated thermite charge over said burnable barrier.
Claim 13
Dependent Claim
31 words
A thermite igniter/heat source of claim 6, wherein the consolidated thermite is hot-pressed at 460°-500° C. and at least 10,000 psi for 15-30 minutes to achieve 80-100% of theoretical maximum density.
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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |