Patent US3991680A successfully refreshed from Google Patents.
US3991680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tagging explosives with sulfur hexafluoride
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-05-15
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Granted: 1976-11-16
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Expires: 1995-05-15
Abstract
Abstract Method and apparatus for tagging explosives with a source of SF 6 permitting the detection of their presence utilizing sensitive sniffing apparatus.
Inventors
- 👤 Russell N. Dietz
- 👤 Edgar A. Cote
- 👤 William Vogel
- 👤 John C. Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:33
CPC Classifications
F; F42; F42D; F42D5/00; F42D5/02; F42B; F42B3/00; F42B3/10; F42B3/103; F42B35/00; Y; Y10; Y10S; Y10S149/00; Y10S149/123
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
38 words
An electrical detonator having a shell containing a detonating material and means for sealing said shell, the improvement comprising a source of SF 6 within said shell, said source releasing said SF 6 over a period of time.
Claim 2
Dependent Claim
38 words
An electrical detonator having a shell containing a detonating material and means for sealing said shell, the improvement comprising a source of SF 6 within said shell, said source releasing said SF 6 over a period of time.
Claim 3
Dependent Claim
22 words
The detonator of claim 1 in which said source is located adjacent to and on the outer side of said sealing means.
Claim 4
Dependent Claim
19 words
The detonator of claim 2 in which said source is a solid member impregnated with said SF 6 .
Claim 5
Dependent Claim
17 words
The detonator of claim 3 in which said source is a fluoropolymer containing adsorbed SF 6 .
Claim 6
Dependent Claim
32 words
The detonator of claim 2 in which said source is a sealed capsule containing liquid SF 6 , said capsule having a permeable window to permit controlled release of SF 6 gas.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |