US2865903A
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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
C; C08; C08F; C08F10/00; D; D01; D01F; D01F6/00; D01F6/02; D01F6/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
PROCESS FOR THE MANUFACTURE OF A SOLID POLYMER OF ETHYLENE HAVING A DENSITY GREATER THAN 0.925 GRAM PER CUBIC CENTIMETER WHICH COMPRISES SUBJECTING GASEOUS ETHYLENE IN THE ABSENCE OF ANY LIQUID REACTION MEDIUM TO A PRESSURE GREATER THAN 1000 ATMOSPHERES AND TO A TEMPERATURE BETWEEN ABOUT 15* AND 150*C., IN THE PRESENCE OF AN ALKYL ESTER OF HYPONITROUS ACID CONTAINING 1 TO 4 CARBON ATOMS AS A POLYMERIZATION CATALYST AND A CHAIN-TRANSFER AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON TETRACHLORIDE AND CHLOROFORM, THE AMOUNT OF SAID CHAIN-TRANSFER AGENT BEING BETWEEN 0.01% AND 5% BY WEIGHT OF ETHYLENE AND SUFFICIENT ONLY TO EFFECT CHAIN TRANSFER WHEREBY SAID PROCESS IS CARRIED OUT UNDER ESSENTIALLY LIQUID-FREE CONDITIONS.
Claim 2
Dependent Claim
116 words
PROCESS FOR THE MANUFACTURE OF A SOLID POLYMER OF ETHYLENE HAVING A DENSITY GREATER THAN 0.925 GRAM PER CUBIC CENTIMETER WHICH COMPRISES SUBJECTING GASEOUS ETHYLENE IN THE ABSENCE OF ANY LIQUID REACTION MEDIUM TO A PRESSURE GREATER THAN 1000 ATMOSPHERES AND TO A TEMPERATURE BETWEEN ABOUT 15* AND 150*C., IN THE PRESENCE OF AN ALKYL ESTER OF HYPONITROUS ACID CONTAINING 1 TO 4 CARBON ATOMS AS A POLYMERIZATION CATALYST AND A CHAIN-TRANSFER AGENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON TETRACHLORIDE AND CHLOROFORM, THE AMOUNT OF SAID CHAIN-TRANSFER AGENT BEING BETWEEN 0.01% AND 5% BY WEIGHT OF ETHYLENE AND SUFFICIENT ONLY TO EFFECT CHAIN TRANSFER WHEREBY SAID PROCESS IS CARRIED OUT UNDER ESSENTIALLY LIQUID-FREE CONDITIONS.
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) | 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 |