US3751521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impact polyolefin compositions comprising e/p block copolymer and high density polyethylene
Assignee: BP Chemicals Ltd
•
Filing: 1971-06-18
•
Granted: 1973-08-07
•
Expires: 1991-06-18
Abstract
Abstract HIGH IMPACT STRENGTH POLYOLEFIN COMPOSITIONS FORMULATED OF 50% TO 98% BY WEIGHT POLYETHYLENE HAVING A SPECIFIC GRAVITY GREATER THAN 0.96 AND 50% TO 2% BY WEIGHT OF A SEQUENCED COPOLYMER FORMED OF 5% TO 50% BY WIEGHT OF A SEQUENCE OBTAINED BY STATISTIC COPOLYMERIZATION OF ETHYLENE AND PROPYLENE WITH THE REMAINDER FORMED OF A PREVIOUS OR SUBSEQUENT SEQUENCE OF POLYMERIZED PROPYLENE.
Inventors
- 👤 I Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:47
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08L23/10; C08L2308/00; C08L2314/00; C08L2314/02; C08L53/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |