Patent US4350096A successfully refreshed from Google Patents.
US4350096A
Expired / Lapsed
US
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Electric device for the ignition by magnetic induction of a pyrotechnic substance
Assignee: Giat Industries SA
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Filing: 1979-10-15
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Granted: 1982-09-21
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Expires: 1999-10-15
Abstract
Abstract This invention relates to an electric device for the ignition of pyrotechnic substances and more particularly an electric device which operates by electromagnetic induction. The device comprises: An induced member 22 placed in a cartridge containing a pyrotechnic substance within a circular opening of the bottom of the case 20, and an inductor located in a cavity 24 made in the thickness of a firing plate 23. The induced member has at least one open turn 31 connected to at least one heating filament 32, mounted on a thin insulating pellet 30, the inductor is a spiroidal winding 25 whose frequency defines the operating frequency of the generator; the inductor comprises a thermal protection means, a mechanical protection means and sealing means. The device can be used in particular in the field of artillery.
Inventors
- 👤 Christian G. Cannavo
- 👤 Georges Cousin
- 👤 Andre Espagnacq
- 👤 Jacques X. Frayssac
- 👤 Loic Y. Laine
- 👤 Daniel J. Midrouillet
- 👤 Andre M. Pintenat
- 👤 Jean B. Reboux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:57
CPC Classifications
F; F41; F41A; F41A19/00; F41A19/58; F41A19/63; F42; F42B; F42B3/00; F42B3/10; F42B3/18; F42C; F42C19/00; F42C19/08; F42C19/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
An electric magnetic induction ignition device for a pyrotechnic substance to be ignited by means of a weapon, comprising an induced member arranged in contact with the pyrotechnic substance, an inductor connected to a current generator and located opposite the induced member and coupled electromagnetically to it, said inductor located in a cavity open to electromagnetic radiations produced in the breech of said weapon, the induced member being formed of at least one open turn made of a material of high specific conductivity, at least one resistive element terminating the opening of each of said turns, the impedance of said turn being substantially the same as the impedance of said terminating element.
Claim 2
Dependent Claim
112 words
An electric magnetic induction ignition device for a pyrotechnic substance to be ignited by means of a weapon, comprising an induced member arranged in contact with the pyrotechnic substance, an inductor connected to a current generator and located opposite the induced member and coupled electromagnetically to it, said inductor located in a cavity open to electromagnetic radiations produced in the breech of said weapon, the induced member being formed of at least one open turn made of a material of high specific conductivity, at least one resistive element terminating the opening of each of said turns, the impedance of said turn being substantially the same as the impedance of said terminating element.
Claim 3
Dependent Claim
26 words
A device according to claim 1, wherein the inductor is a spiroidal winding and comprises a mechanical protection means, a thermal protection means and sealing means.
Claim 4
Dependent Claim
40 words
A device according to claim 2, wherein said inductor is housed in a steel cavity, said steel cavity comprises a means for increasing the electrical conductivity of the walls comprising a film deposit of a metal of high specific conductivity.
Claim 5
Dependent Claim
15 words
A device according to claim 1 wherein the turn is arranged on an insulating pellet.
Claim 6
Dependent Claim
21 words
A device according to claim 4, wherein the turn is made of an insulating support manufactured by a printed circuit technique.
Claim 7
Dependent Claim
25 words
A device according to claim 1 wherein said induced member comprises two open turns which are independent and are each connected to a resistive filament.
Claim 8
Dependent Claim
12 words
A device according to claim 6, whereby the two turns are concentric.
Claim 9
Dependent Claim
12 words
A device according to claim 7, whereby the two turns are adjacent.
Claim 10
Dependent Claim
32 words
A device according to claim 1 wherein said induced member comprises a conductive screen of uniform thickness arranged on the free face of an insulating wafer at least partially masking the turn.
Claim 11
Dependent Claim
42 words
A device according to claim 1 wherein the turn constituting the induced member is rigidly connected with a thin flat support in order to cooperate with an inductor comprising a flat spiroidal winding arranged in the immediate vicinity of the induced member.
Claim 12
Dependent Claim
40 words
A device according to claim 2, wherein said inductor is housed in a steel cavity, said steel cavity comprises a means for increasing the electrical conductivity of the walls comprising a chamber made of a metal of high specific conductivity.
Claim 13
Dependent Claim
31 words
A device according to claim 1 wherein said induced member comprises two open turns which have a point in common and each of said turns is connected to a resistive filament.
References Cited (Backward Citations)
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |