Patent US4256038A successfully refreshed from Google Patents.
US4256038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorocarbon vapor tagging of blasting cap detonators
Assignee: United States Department of Energy
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Filing: 1979-02-06
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Granted: 1981-03-17
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Expires: 1999-02-06
Abstract
Abstract A plug for a blasting cap is made of an elastomer in which is dissolved a perfluorocarbon. The perfluorocarbon is released as a vapor into the ambient over a long period of time to serve as a detectable taggant.
Inventors
- 👤 Russell N. Dietz
- 👤 Gunnar I. Senum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:03
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103; F42B3/107; C; C06; C06B; C06B23/00; C06B23/008; Y; Y10; Y10S; Y10S149/00; Y10S149/123; Y10T; Y10T436/00; Y10T436/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
In an explosive device comprising an electrical detonator having a shell containing detonating material, and means for sealing said shell, the improvement comprising: a mass of material containing a perfluorocarbon which is released over a period of time as a vapor taggant from said mass.
Claim 2
Dependent Claim
45 words
In an explosive device comprising an electrical detonator having a shell containing detonating material, and means for sealing said shell, the improvement comprising: a mass of material containing a perfluorocarbon which is released over a period of time as a vapor taggant from said mass.
Claim 3
Dependent Claim
23 words
An explosive device as defined in claim 1, wherein said mass of material has the form of a plug installed within said shell.
Claim 4
Dependent Claim
25 words
An explosive device as defined in claim 2, wherein said cylindrical plug is flexible so that said plug is crimped into place in said shell.
Claim 5
Dependent Claim
20 words
An explosive device as defined in claim 1, wherein said mass of material is an elastomer compatible within said perfluorocarbon.
Claim 6
Dependent Claim
16 words
An explosive device as defined in claim 4, wherein said perfluorocarbon is dissolved in said elastomer.
Claim 7
Dependent Claim
23 words
An explosive device as defined in claim 5 wherein said perfluorocarbon is one selected from the group of perfluorokycloalkanes perfluoroaromatics; perfluoroalkanes and perfluorocycloalkenes.
Claim 8
Dependent Claim
23 words
An explosive device as defined in claim 2, wherein said elastomer is an elastomer with at least 5% solubility for the perfluorocarbon taggants.
Claim 9
Dependent Claim
19 words
An explosive device as defined in claim 7 wherein the elastomer is a copolymer of vinylidene flouride and hexafluoropropylene.
References Cited (Backward Citations)
US3326731A
Cited
US3415865A
Cited
US3627469A
Cited
US3725671A
Cited
US3818229A
Cited
US3897284A
Cited
US3772099A
Cited
US4018635A
Cited
US3737349A
Cited
US3991680A
Cited
US4018884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |