US3803374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrotechnic circuit maker or breaker
Assignee: Gouvernement de la Republique Francaise
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Filing: 1972-10-27
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Granted: 1974-04-09
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Expires: 1992-10-27
Abstract
Abstract A pyrotechnic device designed to irreversibly make or break a permanent electrical contact as controlled by an initial electrical, mechanical or pyrotechnic signal, the device comprising an elastomer head mounted on the pyrotechnic cartridge and containing a hollow interior portion in which two electrical contact members are disposed, a deformable partition separating the pyrotechnic charge from the elastomer body, and a member which is moved into contact with the two contact elements to either make or break an electrical connection between the two contacts depending upon whether the third element is composed of conducting or insulating material.
Inventors
- 👤 J Delgendre
- 👤 V Guigot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
H; H01; H01H; H01H39/00; H01H39/004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A pyrotechnic device designed to irreversibly make or break a permanent electrical contact as controlled by an initial electrical, mechanical or pyrotechnic signal, comprising: a cartridge having a cavity containing a pyrotechnic charge and means to detonate said charge; an elastomer body disposed on said cartridge; first and second metal contact elements disposed in an interior cavity of said body and connected to external electrical terminals; a deformable partition separating the chargecontaining cavity of said cartridge and the hollow interior cavity of said elastomer body; and a third element resting on said deformable partition and located in said hollow interior cavity and urged into contact with said first and second contact elements when said partition is deformed by the detonation of the said pyrotechnic charge.
Claim 2
Dependent Claim
125 words
A pyrotechnic device designed to irreversibly make or break a permanent electrical contact as controlled by an initial electrical, mechanical or pyrotechnic signal, comprising: a cartridge having a cavity containing a pyrotechnic charge and means to detonate said charge; an elastomer body disposed on said cartridge; first and second metal contact elements disposed in an interior cavity of said body and connected to external electrical terminals; a deformable partition separating the chargecontaining cavity of said cartridge and the hollow interior cavity of said elastomer body; and a third element resting on said deformable partition and located in said hollow interior cavity and urged into contact with said first and second contact elements when said partition is deformed by the detonation of the said pyrotechnic charge.
Claim 3
Dependent Claim
41 words
The device according to claim 1, wherein said third element comprises an electrically conducting member which, when urged into contact with said first and second elements upon deformation of said partition, completes an electrical circuit between said first and second elements.
Claim 4
Dependent Claim
56 words
The device according to claim 1, wherein said third element comprises an insulating member which, when urged into engagement with said first and second contact elements upon deformation of said partition, separates said first and second elements from contact with each other to thereby break a pre-existing completed electrical circuit between said first and second elements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |