US3567691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maleinization of synthetic rubber
Assignee: Shell USA Inc
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Filing: 1967-04-07
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Granted: 1971-03-02
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Expires: 1987-04-07
Abstract
Abstract CONJUGATED DIENE HOMEPOLYMERS HAVING IMPROVED GREEN STRENGTH PROPERTIES AND SATISFACTORY VULCANIZATE PROPERTIES ARE PREPARED BY MASTICATING A SOLVENT FREE POLYMER AT 50-300*C. AND INJECTING DURING MASTICATION A SOLUTION OF MALEIC ANHYDRIDE IN AN AMOUNT OF 0.01-1 PHR.
Inventors
- 👤 Adriaan W Van Breen
- 👤 Pieter Luijk
- 👤 Jacobus M Rellage
- 👤 Christiaan Vervloet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:02
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |