Patent US3735705A successfully refreshed from Google Patents.
US3735705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtered electro-explosive device
Assignee: TE Connectivity Corp
•
Filing: 1971-07-15
•
Granted: 1973-05-29
•
Expires: 1991-07-15
Abstract
Abstract A pyrotechnic device includes a high pass, lossy, ceramic filter on the connector pin of the device. The pyrotechnic device includes a bridging wire between the connector pin and an outer metallic shield. Electrical current passing through the bridging wire detonates an explosive charge. The lossy filter shunts high frequency electrical noise away from the bridging wire thereby preventing accidental detonation of the charge.
Inventors
- 👤 W Hudson
- 👤 W Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:46
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/18; F42B3/188
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
A pyrotechnic device comprising: a powder can, an explosive charge at the bottom of said can, a detonator at the top of said can including: an outer metallic shell, an inner metallic pin, a bridging wire between said outer shell and said pin for detonating said charge when electrical current passes therethrough, and a tubular filter including a substrate of ferrite, a dielectric layer directly on the outer surface of the substrate, and extending about said dielectric material, about the inner surface of said ferrite tube and about the ends of the filter, said metallic plating having gaps near both extremities of said tube to electrically isolate the metallic plating on the outside of said filter from the plating on the inner surface of said tube, the inner metallic plating being in contact with said pin and the outer metallic plating being in contact with said shell so that said filter shunts high frequency electrical energy across said bridging wire without detonating said charge.
Claim 2
Dependent Claim
164 words
A pyrotechnic device comprising: a powder can, an explosive charge at the bottom of said can, a detonator at the top of said can including: an outer metallic shell, an inner metallic pin, a bridging wire between said outer shell and said pin for detonating said charge when electrical current passes therethrough, and a tubular filter including a substrate of ferrite, a dielectric layer directly on the outer surface of the substrate, and extending about said dielectric material, about the inner surface of said ferrite tube and about the ends of the filter, said metallic plating having gaps near both extremities of said tube to electrically isolate the metallic plating on the outside of said filter from the plating on the inner surface of said tube, the inner metallic plating being in contact with said pin and the outer metallic plating being in contact with said shell so that said filter shunts high frequency electrical energy across said bridging wire without detonating said charge.
Claim 3
Dependent Claim
17 words
The pyrotechnic device recited in claim 1 wherein said dielectric is barium titanate coated on said substrate.
References Cited (Backward Citations)
US3351012A
Cited
US3572247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |