US3809964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically actuated priming device
Assignee: Ministère des Armées
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Filing: 1972-11-10
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Granted: 1974-05-07
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Expires: 1992-11-10
Abstract
Abstract A priming device actuated by electrical induction and comprising a primer containing a pyrotechnical substance, an armature placed in contact with or proximate to the pyrotechnical substance and an inductor for producing an alternating magnetic field which causes electrical heating of the armature by induction. The armature can be separate from or formed of all or part of a casing containing the pyrotechnical substance.
Inventors
- 👤 B Ceyrat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:48
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/12; F41; F41A; F41A19/00; F41A19/58; F41A19/63; F42B; F42B5/00; F42B5/02; F42B5/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
An electrically actuated priming device for effecting explosive priming by electrical induction, said arrangement comprising: a priming device comprising a closed outer housing composed of a synthetic electrically non-conductive material, a pyrotechnical substance sensitive to heat in said housing and an armature, constituted as a thin metallic inner housing enclosing and in contact with said pyrotechnical substance to transmit heat thereto, placed in totality in the interior of the outer housing, and induction means in said outer housing and being separated from said armature and physically unconnected therewith for producing an alternating magnetic field around said armature to cause heating of said armature by electrical induction, said induction means being connected to an electrical generator.
Claim 2
Dependent Claim
115 words
An electrically actuated priming device for effecting explosive priming by electrical induction, said arrangement comprising: a priming device comprising a closed outer housing composed of a synthetic electrically non-conductive material, a pyrotechnical substance sensitive to heat in said housing and an armature, constituted as a thin metallic inner housing enclosing and in contact with said pyrotechnical substance to transmit heat thereto, placed in totality in the interior of the outer housing, and induction means in said outer housing and being separated from said armature and physically unconnected therewith for producing an alternating magnetic field around said armature to cause heating of said armature by electrical induction, said induction means being connected to an electrical generator.
Claim 3
Dependent Claim
17 words
An arrangement according to claim 1 wherein said induction means is electrically insulated from said pyrotechnical substance.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |