US3702352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline block copolymers of aliphatic alpha-olefins and process of preparing same
Assignee: Dart Industries Inc
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Filing: 1970-11-16
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Granted: 1972-11-07
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Expires: 1990-11-16
Abstract
Abstract NOVEL COMPOSITIONS OF BLOCK COPOLYMERS OF ALPHAOLEFINS AND PROCESSES THEREFOR WHICH COMPOSITIONS HAVE IMPROVED CONTACT CLARITY WHEN MOLDED OVER COMPOSITIONS OF THE PRIOR ART PROCESSES. THE COMPOSITIONS COMPRISE (A) 80% TO 95% BY WEIGHT OF A PRE-SEGMENT CONSISTING ESSENTIALLY OF A RANDOM COPOLYMER OF (1) 90-98.5 MOLE PERCENT OF AN ALPHA-OLEFIN HAVING 2 TO 9 CARBON ATOMS AND (2) 1.5-10 MOLE PERCENT OF AN ALPHAOLEFIN HAVING 2 TO 9 CARBON ATOMS DIFFERENT FROM (1), (B) 5% TO 20% BY WEIGHT OF A POST-SEGMENT CONSISTING ESSENTIALLY OF A HOMOPOLYMER OF AN ALPHA-OLEFIN HAVING 2 TO 9 CARBON ATOMS WHICH IS THE SAME AS (A) (1).
Inventors
- 👤 Irving Leibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |