US5175223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New fluoroelastomers based on vinylidene fluoride, hexafluoropropene and tetrafluoroethylene
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1991-03-07
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Granted: 1992-12-29
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Expires: 2011-03-07
Abstract
Abstract The invention relates to new fluoroelastomers endowed with a low Tg and a low compression set at low temperature, characterized by the following monomeric composition: ______________________________________ vinylidene fluoride: 60.5-64% by weight hexafluoropropene: 30-33% by weight tetrafluoroethylene: 5-8% by weight. ______________________________________
Inventors
- 👤 Giulio Brinati
- 👤 Margherita Albano
- 👤 Vincenzo Arcella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:21
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F214/00; C08F214/18; C08F214/22; C08F214/222
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
Fluoroelastomers endowed with a T g equal to or less than about -25° C. and a compression set, after a 70 hour compression test at 0° C. on a disc, according to ASTM D 395 test, method B, equal to or less than about 18% when measured at 23° C. after 30 minutes, comprising the following monomeric composition: ______________________________________
vinylidene fluoride:
60.5-64% by weight
hexafluoropropene: 30-33% by weight
tetrafluoroethylene:
5-8% by weight.
______________________________________
Claim 2
Dependent Claim
73 words
Fluoroelastomers endowed with a T g equal to or less than about -25° C. and a compression set, after a 70 hour compression test at 0° C. on a disc, according to ASTM D 395 test, method B, equal to or less than about 18% when measured at 23° C. after 30 minutes, comprising the following monomeric composition: ______________________________________
vinylidene fluoride:
60.5-64% by weight
hexafluoropropene: 30-33% by weight
tetrafluoroethylene:
5-8% by weight.
______________________________________
Claim 3
Dependent Claim
9 words
Articles manufactured from a fluoroelastomer conforming to claim 1.
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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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |