Patent US3755256A successfully refreshed from Google Patents.
US3755256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polysulphones containing phosphorus compounds to increase melt stability
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-02-25
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Granted: 1973-08-28
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Expires: 1992-02-25
Abstract
Abstract A thermoplastic composition comprising (a) 96 to 99.9 percent by weight of at least one aromatic polysulphone and (b) 4 to 0.01 percent by weight of at least one phosphorus compound having the formula Y3PQ in which Y is a univalent organic radical which may be the same or different and Q is oxygen or sulphur.
Inventors
- 👤 G Beverly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:04
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; Y; Y10; Y10S; Y10S525/00; Y10S525/906
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
40 words
A thermoplastic composition according to claim 1 in which Y is a group having the formula RO where R is an univalent alkyl, aryl, aralkyl, alkaryl or alicyclic group consisting of up to 20 carbon atoms and Q is oxygen.
Claim 2
Dependent Claim
15 words
A thermoplastic composition according to claim 1 in which the phosphorus compound is triphenyl phosphate.
Claim 3
Dependent Claim
18 words
A thermoplastic composition according to claim 1 in which the aromatic polysulphone has repeating units of the formula
Claim 4
Dependent Claim
18 words
A thermoplastic composition according to claim 1 in which the aromatic polysulphone has repeating units of the formula
Claim 5
Dependent Claim
14 words
A thermoplastic composition according to claim 1 in the form of a moulded article.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |