US3704274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the scorch life of butyl rubber
Assignee: Covestro International SA
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Filing: 1970-12-18
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Granted: 1972-11-28
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Expires: 1990-12-18
Abstract
Abstract A SOLUTION IS PREPARED OF BUTYL RUBBER AND A PHENOL CURING RESIN IN AN ORGANIC SOLVENT, AND THE SOLVENT IS THEN EVAPORATED TO PROVIDE DRY BUTYL RUBBER HAVING THE RESIN INTIMATELY DISPERSED THEREIN. COMPOUNDS PRODUCED FROM THIS RESIN-CONTAINING RUBBER ARE CHARACTERIZED BY A SCORCH LIFE WHICH IS CONSIDERABLY LONGER THAN THAT WHICH IS ACHIEVED BY CONVENTIONAL DRY MIXING OF THE RUBBER WITH THE CURING RESIN. THIS NEW PROCESS CAN BE USED TO PARTICULAR ADVANTAGE IN THE MANUFACTURE OF CURING BAGS WHICH ARE USED TO APPLY INTERNAL HEAT AND PRESSURE TO PNEUMATIC VEHICLE TIRES DURING THE VULCANIZATION THEREOF.
Inventors
- 👤 John E Callan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:59
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |