US2865904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerisation
Assignee: Imperial Chemical Industries Ltd
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Filing: 1956-02-28
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Granted: 1958-12-23
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Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Seed Leslie
- 👤 Pajaczkowski Andrzej
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:16
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S260/00; Y10S260/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
PROCESS FOR THE MANUFACTURE OF SOLID POLYMERS OF ETHYLENE WHICH COMPRISES SUBJECTING GASEOUS ETHYLENE TO A PRESSURE GREATER THAN 500 ATMOSPHERES AND A TEMPERATURE BETWEEN 10*C. AND 50*C., IN THE PRESENCE OF AN A-SUBSTITUTED ACYL PEROXIDE CATALYST SELECTED FROM THE GROUP CONSISTING OF DI-ISOBUTYRYL PEROXIDE, DI-PIVALYL PEROXIDE, BIS-A-METHOXY ISOBUTYRYL PEROXIDE, AND BIS-BMETHOXY ISOBUTYRYL PEROXIDE.
Claim 2
Dependent Claim
54 words
PROCESS FOR THE MANUFACTURE OF SOLID POLYMERS OF ETHYLENE WHICH COMPRISES SUBJECTING GASEOUS ETHYLENE TO A PRESSURE GREATER THAN 500 ATMOSPHERES AND A TEMPERATURE BETWEEN 10*C. AND 50*C., IN THE PRESENCE OF AN A-SUBSTITUTED ACYL PEROXIDE CATALYST SELECTED FROM THE GROUP CONSISTING OF DI-ISOBUTYRYL PEROXIDE, DI-PIVALYL PEROXIDE, BIS-A-METHOXY ISOBUTYRYL PEROXIDE, AND BIS-BMETHOXY ISOBUTYRYL PEROXIDE.
References Cited (Backward Citations)
US2559630A
Cited
US2728756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |