US3794615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt stabilized aromatic polysulphones with phosphorus compounds
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-02-22
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Granted: 1974-02-26
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Expires: 1992-02-22
Abstract
Abstract A THERMOPLASTIC COMPOSITION COMPRISES (A) 96 TO 99.9% BY WEIGHT OF AT LEAST ONE AROMATIV POLYSULPHONE AND (B) 4 TO 0.01% BY WEIGHT OF AT LEAST ONE SALT OF AT LEAST ONE OXY-ACID OF PHOSPHORUS CONTAINING AN ALKALI METAL AND OR ALKALINE EARTH.
Inventors
- 👤 G Beverly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |