Patent US3629371A successfully refreshed from Google Patents.
US3629371A
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US
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Chloroalkylated block copolymers
Assignee: Shell USA Inc
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Filing: 1968-10-21
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Granted: 1971-12-21
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Expires: 1988-10-21
Abstract
Abstract CHLOROALKYLATED BLOCK COPOLYMERS HAVING A HIGH RETENTION OR RHEOLOGICAL PROPERTIES COMPRISE CHLOROALKYLATED MONOVINYL ARENE POLYMER BLOCKS CONNECTED BY ALPHAOLEFIN (E.G., HYDROGENATED POLYISOPRENE) POLYMER BLOCKS.
Inventors
- 👤 De Loss E Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:42
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/24; C08F8/30; C08F8/32
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |