US3763782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal layer initiator
Assignee: Dynamit Nobel AG
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Filing: 1971-04-26
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Granted: 1973-10-09
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Expires: 1991-04-26
Abstract
Abstract An electric detonator element in which an ignition bridge, intended to set off a charge, is formed on one side of a nonconductive carrier which is inserted into a conductive housing with one surface contacting a pole piece and the other surface having the bridge formed thereon being pressed against the primer charge which is electrically connected with the housing, and conductive means interconnecting the bridge on one side of the carrier with the surface of the carrier contacting the pole piece either through a bore in the carrier or around the periphery thereof.
Inventors
- 👤 P Roh
- 👤 H Bendler
- 👤 U Brede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:44
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103; F42B3/195
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
153 words
In an electrical detonator element including a pole piece and a housing means forming a pair of electrical leads, a primer composition and an ignition bridge element disposed with said primer composition between said pole piece and said housing means, said ignition bridge element comprising an insulating body having first electrode means arranged on at least a first surface of said body for electrically contacting said pole piece and second electrode means arranged on a second surface of said body for electrically contacting said housing means, each of said first and second electrode means including an electrode member formed on said second surface of said body, and a bridge member of a size providing a specific electrical resistance interconnecting said first and second electrode means, said bridge member being provided as a plated metal layer on said second surface of said body in overlapping relationship with portions of each of said electrode members.
Claim 2
Dependent Claim
153 words
In an electrical detonator element including a pole piece and a housing means forming a pair of electrical leads, a primer composition and an ignition bridge element disposed with said primer composition between said pole piece and said housing means, said ignition bridge element comprising an insulating body having first electrode means arranged on at least a first surface of said body for electrically contacting said pole piece and second electrode means arranged on a second surface of said body for electrically contacting said housing means, each of said first and second electrode means including an electrode member formed on said second surface of said body, and a bridge member of a size providing a specific electrical resistance interconnecting said first and second electrode means, said bridge member being provided as a plated metal layer on said second surface of said body in overlapping relationship with portions of each of said electrode members.
Claim 3
Dependent Claim
81 words
An electrical detonator element according to claim 1, wherein said insulating body is formed as a round disc having a bore therethrough, and said first electrode means includes a conductive layer provided on the first surface of said body in contact with said pole piece and a metal portion plated on the surface of said bore electrically interconnecting said conductive layer on said first surface with said electrode member of said first electrode means on said second surface of said body.
Claim 4
Dependent Claim
60 words
An electrical detonator element according to claim 1, wherein said insulating body is formed as a round disc, said first electrode means including a conductive layer on said first surface of said body contacting said pole piece and means for connecting said conductive layer to said electrode member of said first electrode means on said second surface of said body.
Claim 5
Dependent Claim
18 words
An electrical detonator element according to claim 3, wherein said connecting means is provided as a metallic foil.
Claim 6
Dependent Claim
19 words
An electrical detonator element according to claim 4, wherein said connecting meanS extends around the periphery of said disc.
Claim 7
Dependent Claim
19 words
An electrical detonator element according to claim 4, wherein said connecting means extends through a bore in said disc.
Claim 8
Dependent Claim
32 words
An electrical detonator element according to claim 3, wherein said insulating body is provided as a round disc having a portion thereof removed to serve as a key to the orientation thereof.
Claim 9
Dependent Claim
27 words
An electrical detonator element according to claim 7, wherein said connecting means is a metallic foil extending around the periphery of said disc at said removed portion.
Claim 10
Dependent Claim
19 words
An electrical detonator element according to claim 1, wherein said bridge member is arranged for contacting said primer composition.
Claim 11
Dependent Claim
21 words
An electrical detonator element according to claim 1, characterized in that said insulating body is formed of sintered aluminum oxide material.
Claim 12
Dependent Claim
32 words
An electrical detonator element according to claim 1, wherein said insulating body is provided as a round disc having a portion thereof removed to serve as a key to the orientation thereof.
Claim 13
Dependent Claim
31 words
An electrical detonator element according to claim 1, said bridge member having a width and a length of 50 - 100 Mu and a thickness of 0.1 - 1.5 Mu .
Claim 14
Dependent Claim
39 words
An electrical detonator element according to claim 1, wherein said electrode members are formed of a conductive material selected from the group consisting of nickel, palladium, palladium silver alloy, palladium gold, platinum gold, platinum silver, or a silver-aluminum alloy.
Claim 15
Dependent Claim
21 words
An electrical detonator element according to claim 13, wherein said electrode members are applied to said insulating body by currentless galvanizing.
Claim 16
Dependent Claim
26 words
An electrical detonator element according to claim 14, wherein said bridge member consists of a metal selected from the group consisting of tantalum and tantalum nitride.
Claim 17
Dependent Claim
26 words
An electrical detonator element according to claim 1, wherein said bridge member consists of a metal selected from the group consisting of tantalum and tantalum nitride.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |