Patent US3595829A successfully refreshed from Google Patents.
US3595829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-07-29
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Granted: 1971-07-27
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Expires: 1988-07-29
Abstract
Abstract SYNTHETIC LINEAR POLYAMIDES ARE STABILISED AGAINST THE DEGRADATIVE EFFECTS OF HEAT BY INCORPORATING THEREWITH A STABILISING COMPOSITION, DEVOID OF COPPER AND COPPER SALTS, AND COMPRISING A MIXTURE OF A DIPHENYLAMINE SUBSTITUTED IN EACH OF THE POSITIONS PARA TO THE AMINO GROUP BY AN ALKYL, CYCLOALKYL OR ARALKYL GROUP WITH A PHOSPHORUS ACID OF THE GENERAL FORMULA IN WHICH R REPRESENTS A HYDROGEN ATOM, OR AN ALKYL, CYCLOALKYL, ARALKYL, ARYL OR HYDROXYL GROUP, OR WITH A SALT OR ESTER OF A SAID ACID. R-PH(=O)-OH
Inventors
- 👤 Geoffrey Spencer Davy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:25
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |