Patent US3598884A successfully refreshed from Google Patents.
US3598884A
Expired / Lapsed
US
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Cross-linking of polymers
Assignee: Polysar Ltd
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Filing: 1968-07-12
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Granted: 1971-08-10
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Expires: 1988-07-12
Abstract
Abstract CROSS-LINKED BLOCK COPOLYMERIC MATERIALS WITH GOOD ELASTOMERIC PROPERTIES ARE PREPARED BY MIXING BLOCK COPOLYMERS HAVING ONE REACTIVE CHAIN END, WITH BLOCK COPOLYMERS HAVING AT LEAST TWO REACTIVE CHAIN ENDS, PREFERABLY IN SOLUTION, AND ADDING A COUPLING AGENT WHICH HAS AT LEAST THREE REACTIVE SITES CAPABLE OF REACTING WITH THE REACTIVE BLOCK COPOLYMERIC CHAIN ENDS.
Inventors
- 👤 Yung-Kang Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |