US4446294A
Expired / Lapsed
US
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Aromatic etherketone/sulphone copolymers
Assignee: Victrex Manufacturing Ltd
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Filing: 1983-06-15
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Granted: 1984-05-01
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Expires: 2003-06-15
Abstract
Abstract Amorphous aromatic etherketone/sulphone copolymers, normally of reduced viscosity>/=0.8, containing 15 to 70 mole % (preferably 20 to 60 mole %) of repeat units of formula <IMAGE> A and correspondingly 85 to 30 mole % (preferably 80 to 40 mole %) of repeat units of formula <IMAGE> B
Inventors
- 👤 John B. Rose
- 👤 Michael B. Cinderey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:37
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4012; C08G75/00; C08G75/20; C08G75/23; C08L; C08L2205/00; C08L2205/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
An amorphous aromatic etherketone/sulphone copolymer containing 15 to 70 mole % of repeat units of formula ##STR7## and correspondingly 85 to 30 mole % of repeat units of formula ##STR8##
Claim 2
Dependent Claim
30 words
An amorphous aromatic etherketone/sulphone copolymer containing 15 to 70 mole % of repeat units of formula ##STR7## and correspondingly 85 to 30 mole % of repeat units of formula ##STR8##
Claim 3
Dependent Claim
28 words
An etherketone/sulphone copolymer according to claim 1, containing 20 to 60 mole % of repeat units A and correspondingly 80 to 40 mole % of repeat units B.
Claim 4
Dependent Claim
16 words
An etherketone/sulphone copolymer according to claim 1 which has reduced viscosity RV of at least 0.8.
Claim 5
Dependent Claim
16 words
An etherketone/sulphone copolymer according to claim 3 which has reduced viscosity RV of at least 1.0.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |