US4329924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric primer with conductive composition
Assignee: Giat Industries SA
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Filing: 1979-09-11
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Granted: 1982-05-18
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Expires: 1999-09-11
Abstract
Abstract The primer comprises a conductive pyrotechnical priming composition 3, placed in contact with the useful pyrotechnical charge 2 of the primer and two electrodes 6 and 7 arranged in electrical contact with the conductive pyrotechnical composition 3. The two electrodes 6 and 7 are connected to a stable electric resistor 10, connected in parallel to the conductive pyrotechnical composition 3.
Inventors
- 👤 Guy J. Lagofun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:16
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
Electrical primer comprising a conductive pyrotechnical priming composition placed in contact with a useful pyrotechnical charge, and two electrodes in electrical contact with the conductive pyrotechnical composition, the two electrodes being further connected to a stable electrical resistor whch is thereby connected in parallel to the conductive pyrotechnical composition, one of the electrodes comprising a metallic washer, the remaining of said electrodes comprising a metallic body having a flat surface parallel to a surface of said washer, said surfaces being separated by a washer of electrical resistance material forming said electrical resistor, and said washers forming a cylindrical cavity filled with said conductive pyrotechnical priming composition.
Claim 2
Dependent Claim
106 words
Electrical primer comprising a conductive pyrotechnical priming composition placed in contact with a useful pyrotechnical charge, and two electrodes in electrical contact with the conductive pyrotechnical composition, the two electrodes being further connected to a stable electrical resistor whch is thereby connected in parallel to the conductive pyrotechnical composition, one of the electrodes comprising a metallic washer, the remaining of said electrodes comprising a metallic body having a flat surface parallel to a surface of said washer, said surfaces being separated by a washer of electrical resistance material forming said electrical resistor, and said washers forming a cylindrical cavity filled with said conductive pyrotechnical priming composition.
Claim 3
Dependent Claim
33 words
An electrical primer according to claim 1, whereby said electrical resistor has an ohmic value which is substantially between 0.8 and 2 times that of the static resistance of the conductive pyrotechnical composition.
Claim 4
Dependent Claim
27 words
An electrical primer according to claims 1 or 2, characterized by the fact that the electrical resistor connected in parallel is made of a graphite-filled thermoplastic material.
Claim 5
Dependent Claim
25 words
An electric primer according to claim 1, whereby the electrical resistor connected in parallel is made of rubber containing between 3 and 10% of graphite.
Claim 6
Dependent Claim
26 words
An electrical primer according to claim 1, whereby the electrically resistant material of said resistor has a resistivity which is substantially between 300 and 2000 ohm-cm.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |