US3642727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanisation process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-07-11
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Granted: 1972-02-15
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Expires: 1989-07-11
Abstract
Abstract VULCANISED RUBBER HAVING IMPROVED RESISTANCE TO HEAT ARE OBTAINED BY HEATING UNVULCANISED RUBBER WITH BIS(DIHYDROCARBYLTHIOPHOSPHORYL) TRI- OR TETRA-SULPHIDES, PREFERABLY IN PRESENCE OF ELEMENTAL SULPHUR AND A CONVENTIONAL SULPHUR-CURING ACCELERATOR.
Inventors
- 👤 Brian Thomas Ashworth
- 👤 Donald Harper
- 👤 Peter Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5398
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |