Patent US4469623A successfully refreshed from Google Patents.
US4469623A
Expired / Lapsed
US
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Detection of articles
Assignee: 3M Co
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Filing: 1983-08-24
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Granted: 1984-09-04
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Expires: 2003-08-24
Abstract
Abstract Vapor permeable microcapsules filled with volatile perfluoroalkyl bromide and used to tag articles for the detection thereof.
Inventors
- 👤 Richard D. Danielson
- 👤 Robert A. Prokop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:42
CPC Classifications
G; G01; G01V; G01V9/00; Y; Y10; Y10S; Y10S149/00; Y10S149/123; Y10S252/00; Y10S252/965; Y10T; Y10T436/00; Y10T436/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
The method of detecting an article which comprises associating therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms, vapors of which diffuse through the walls of the microcapsules and are emitted into the atmosphere surrounding said article, and detecting the presence of said vapors in said atmosphere and thus the presence of said article.
Claim 2
Independent Claim
90 words
The method of detecting an article which comprises associating therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms, vapors of which diffuse through the walls of the microcapsules and are emitted into the atmosphere surrounding said article, and detecting the presence of said vapors in said atmosphere and thus the presence of said article.
Claim 3
Dependent Claim
19 words
The method according to claim 1 wherein said detection of said vapors is carried out by gas electron-capture detection.
Claim 4
Dependent Claim
85 words
An article having associated therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms, vapors of which diffuse through the walls of the microcapsules into the atmosphere surrounding said article in an amount sufficient to permit detection of said vapors in said atmosphere and thus the presence of said article.
Claim 5
Dependent Claim
85 words
An article having associated therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms, vapors of which diffuse through the walls of the microcapsules into the atmosphere surrounding said article in an amount sufficient to permit detection of said vapors in said atmosphere and thus the presence of said article.
Claim 6
Dependent Claim
57 words
Exposives or explosive devices containing or having associated therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide as a detection taggant, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms.
Claim 7
Dependent Claim
57 words
Exposives or explosive devices containing or having associated therewith, as a tag, vapor permeable microcapsules containing volatile perfluoroalkyl bromide as a detection taggant, wherein said perfluoroalkyl bromide has the formula R f Br where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms.
References Cited (Backward Citations)
US2647933A
Cited
US3255352A
Cited
US3460972A
Cited
US3420877A
Cited
US3516941A
Cited
US3765007A
Cited
US3658928A
Cited
US3773573A
Cited
US3843557A
Cited
US3877374A
Cited
US4138356A
Cited
US3991680A
Cited
US4399226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |