US4256038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorocarbon vapor tagging of blasting cap detonators
Assignee: United States Department of Energy
•
Filing: 1979-02-06
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Granted: 1981-03-17
•
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 10:59
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.
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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) | 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 |