US3828677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric ignition element with secondary ignition capability
Assignee: United States Department of the Army
•
Filing: 1973-06-11
•
Granted: 1974-08-13
•
Expires: 1993-06-11
Abstract
Abstract An electric ignition element having primary and secondary ignition circuits. If the primary ignition circuit fails, the secondary ignition circuit is activated.
Inventors
- 👤 S Kaszupski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:54
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
An electric ignition element comprising a housing, an electrically conductive explosive primer powder mix supported by said housing and effective to ignite upon receiving an energizing current, a nonexplosive impedance element in contact with said primer powder mix and effective when energized to ignite said primer powder mix prior to ignition of the primer powder mix by an energizing current, and an electric circuit having input terminals coupled to the primer powder mix and the impedance element for supplying energizing current thereto.
Claim 2
Dependent Claim
82 words
An electric ignition element comprising a housing, an electrically conductive explosive primer powder mix supported by said housing and effective to ignite upon receiving an energizing current, a nonexplosive impedance element in contact with said primer powder mix and effective when energized to ignite said primer powder mix prior to ignition of the primer powder mix by an energizing current, and an electric circuit having input terminals coupled to the primer powder mix and the impedance element for supplying energizing current thereto.
Claim 3
Dependent Claim
32 words
An electric ignition element according to claim 1 wherein said housing is electrically conductive and connected to one of said input terminals and to said primer powder mix and said impedance element.
Claim 4
Dependent Claim
21 words
An electric ignition element according to claim 2 wherein said primer powder mix and said impedance element are connected in parallel.
Claim 5
Dependent Claim
28 words
An electric ignition element according to claim 3 wherein the parallel combination of said primer powder mix and said impedance element is connected in series with said housing.
Claim 6
Dependent Claim
16 words
An electric ignition element according to claim 4 wherein said impedance element is a resistance wire.
Claim 7
Dependent Claim
153 words
An electric ignition element comprising an electrically conductive sleeve, an electrically conductive tubular ground ring supported in the interior of and in contact with said sleeve, an electrically conductive explosive primer powder mix supported in the interior of and in contact with said ground ring and effective to ignite upon receiving an energizing current, an electrically conductive contact member supported in the interior of said sleeve and having a portion in contact with said primer powder mix, a nonexplosive impedance element connected to said ground ring and said contact member and effective when energized to ignite said primer powder mix prior to ignition of the primer powder mix by an energizing current, and an electric circuit for providing energizing current to said primer powder mix and said impedance element, one input terminal of said electric circuit connected to said contact member and another input terminal of said electric circuit connected to said sleeve.
Claim 8
Dependent Claim
153 words
An electric ignition element comprising an electrically conductive sleeve, an electrically conductive tubular ground ring supported in the interior of and in contact with said sleeve, an electrically conductive explosive primer powder mix supported in the interior of and in contact with said ground ring and effective to ignite upon receiving an energizing current, an electrically conductive contact member supported in the interior of said sleeve and having a portion in contact with said primer powder mix, a nonexplosive impedance element connected to said ground ring and said contact member and effective when energized to ignite said primer powder mix prior to ignition of the primer powder mix by an energizing current, and an electric circuit for providing energizing current to said primer powder mix and said impedance element, one input terminal of said electric circuit connected to said contact member and another input terminal of said electric circuit connected to said sleeve.
Claim 9
Dependent Claim
24 words
An electric ignition element according to claim 6 wherein said impedance element is a resistance wire and is embedded in said primer powder mix.
Claim 10
Dependent Claim
21 words
An electric ignition element according to claim 6 wherein said impedance element and said primer powder mix are connected in parallel.
Claim 11
Dependent Claim
38 words
An electric ignition element according to claim 6 wherein said impedance element and said primer powder mix are connected in parallel and the parallel combination connected in series with the contact member, the ground ring, and the sleeve.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |