US3576933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linking process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-05-02
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Granted: 1971-04-27
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Expires: 1989-05-02
Abstract
Abstract A PROCESS FOR THE PREPARATION OF A SHAPED ARTICLE OF A CROSS-LINKED POLYMERIC MATERIAL BY SUBJECTING A SHAPED ARTICLE OF A CRYSTALLINE POLYMER, PARTICULARLY A CRYSTALLINE POLOYLEFIN, CONTAINING A THERMALLY ACTIVATABLE CROSS-LINKING AGENT PARTICULARLY A FREE-RADICAL GENERATOR, TO A PRESSURE SUFFICIENT TO CAUSE A RISE OF AT LEAST 10*C. IN THE CRYSTALLINE MELTING POINT OF THE POLYMER AND HEATING THE SHAPED ARTICLE WHILE SUBJECTED TO THE PRESSURE TO A TEMPERATURE WHICH IS BELOW THE CRYSTALLINE MELTING POINT OF THE POLYMER AT THE SAID PRESSURE AND AT WHICH CROSS-LINKING WILL OCCUR.
Inventors
- 👤 Robert Frederick Bates
- 👤 John Scanlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |