US3328486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions comprising polyethylene and an ethylene-propylene block copolymer
Assignee: Imperial Chemical Industries Ltd
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Filing: 1962-05-16
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Granted: 1967-06-27
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Expires: 1982-05-16
Abstract
No abstract record available.
Inventors
- 👤 Crawford John William Croom
- 👤 Oakes William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08L53/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A COMPOSITION COMPRISING POLYTHENE THAT HAS BEEN PREPARED BY POLYMERISING ETHYLENE AT A PRESSURE ABOVE 500 ATMOSPHERS AND HAS A DENSITY OF 23*C. NOT GREATER THAN 0.935 AND A MELT FLOW INDEX OF FROM 0.1 TO 100, AND FROM 1% TO 90%, BY WEIGHT OF THE COMPOSITION, OF A COPOLYMER OF ETHYLENE AND PROPYLENE, THIS COPOLYMER BEING A SUBSTANTIALLY HYDROCARBON-INSOLUBLE BLOCK COPOLYMER AT 50*C. CONTAINING FROM 5% TO 50% OF ETHYLENE, BY WEIGHT OF THE COPOLYMER, AND CONTAINING AT LEAST TWO BLOCKS SELECTED FROM ETHYLENE HOMOPOLYMER, PROPYLENE HOMOPOLYMER, AND ETHYLENE/PROPYLENE RANDOM COPOLYMER BLOCKS.
Claim 2
Dependent Claim
93 words
A COMPOSITION COMPRISING POLYTHENE THAT HAS BEEN PREPARED BY POLYMERISING ETHYLENE AT A PRESSURE ABOVE 500 ATMOSPHERS AND HAS A DENSITY OF 23*C. NOT GREATER THAN 0.935 AND A MELT FLOW INDEX OF FROM 0.1 TO 100, AND FROM 1% TO 90%, BY WEIGHT OF THE COMPOSITION, OF A COPOLYMER OF ETHYLENE AND PROPYLENE, THIS COPOLYMER BEING A SUBSTANTIALLY HYDROCARBON-INSOLUBLE BLOCK COPOLYMER AT 50*C. CONTAINING FROM 5% TO 50% OF ETHYLENE, BY WEIGHT OF THE COPOLYMER, AND CONTAINING AT LEAST TWO BLOCKS SELECTED FROM ETHYLENE HOMOPOLYMER, PROPYLENE HOMOPOLYMER, AND ETHYLENE/PROPYLENE RANDOM COPOLYMER BLOCKS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |