Patent US3756154A successfully refreshed from Google Patents.
US3756154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety detonator
Assignee: Safety Devices Inc
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Filing: 1971-07-30
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Granted: 1973-09-04
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Expires: 1991-07-30
Abstract
Abstract This invention relates to a detonator oriented towards the prevention of failure due to ''''arcing'''' or premature firing caused by ambient RF energy. (i.e., Radio, radar or microwave transmitters and static electricity.
Inventors
- 👤 R Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:33
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
In an electric blasting cap, leadin wires (1) a firing initiator connected across the leadin wires (2) and an explosive change (3) adjacent to the firing initiator adapted to be ignited by said firing initiator, wherein said initiator is a thermistor.
Claim 2
Dependent Claim
41 words
In an electric blasting cap, leadin wires (1) a firing initiator connected across the leadin wires (2) and an explosive change (3) adjacent to the firing initiator adapted to be ignited by said firing initiator, wherein said initiator is a thermistor.
Claim 3
Dependent Claim
24 words
Within an electric blasting cap as set forth in claim 1 where there is further provided an insulating means disposed around the firing initiator.
Claim 4
Dependent Claim
19 words
In an electric blasting cap as set forth in claim 2 where the insulating means is a flouride-carbon insulation.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |