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US4306993A
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Microcapsules containing perfluoroalkyl pentafluorosulfide
Assignee: 3M Co
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Filing: 1978-09-28
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Granted: 1981-12-22
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Expires: 1998-09-28
Abstract
Abstract Vapor permeable microcapsules filled with volatile perfluoroalkyl pentafluorosulfide 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 16:34
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/008; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
Vapor permeable microcapsules containing perfluoroalkyl pentafluorosulfide, the walls of the microcapsules being permeable to vapor of said pentafluorosulfide.
Claim 2
Dependent Claim
18 words
Vapor permeable microcapsules containing perfluoroalkyl pentafluorosulfide, the walls of the microcapsules being permeable to vapor of said pentafluorosulfide.
Claim 3
Dependent Claim
13 words
Microcapsules according to claim 1 wherein said microcapsules are made of urea-formaldehyde polymer.
Claim 4
Dependent Claim
19 words
Microcapsules of any of claims 1 or 2 where said pentafluorosulfide is C 6 F 13 SF 5 .
Claim 5
Dependent Claim
39 words
Microcapsules according to claim 2 wherein said pentafluorosulfide has the formula R f SF 5 where R f is a straight chain, branched chain, or cyclic perfluoroalkyl radical, or a combination thereof, and contains 3 to 20 carbon atoms.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |