US2932632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyethylene having improved processability
Assignee: EIDP Inc
•
Filing: 1953-10-21
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Granted: 1960-04-12
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Expires: 1973-10-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Barry
- 👤 William M D Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A PROCESS FOR THE PREPARATION OF A MIXTURE OF NORMALLY SOLID POLYMERS OF ETHYLENE POSSESSING IMPROVED PROCESSABILITY DENSITY, STIFFNESS, YIELD POINT, AND TEAR STRENGTH, AND CONTAINING A HOMOPOLYMER OF ETHYLENE AND FROM 10 TO ABOUT 90% BY WEIGHT OF A 2-POLYETHYLENE PROPANE, HAVING A MONOFILAMENT DRAW RATE OF AT LEAST 50 FEET PER MINUTE, THE STEP WHICH COMPRISES HEATING ETHYLENE TO A TEMPERATURE BETWEEN 140*C. AND 250*C. AND UNDER A PRESSURE BETWEEN 800 AND 2,000 ATMOSPHERES IN THE PRESENCE OF A FREE RADICAL-PRODUCING ETHYLENE POLYMERIZATION CATALYST AND FROM 2 TO 20% BY WEIGHT OF PROPANE BASED ON THE ETHYLENE.
Claim 2
Dependent Claim
100 words
IN A PROCESS FOR THE PREPARATION OF A MIXTURE OF NORMALLY SOLID POLYMERS OF ETHYLENE POSSESSING IMPROVED PROCESSABILITY DENSITY, STIFFNESS, YIELD POINT, AND TEAR STRENGTH, AND CONTAINING A HOMOPOLYMER OF ETHYLENE AND FROM 10 TO ABOUT 90% BY WEIGHT OF A 2-POLYETHYLENE PROPANE, HAVING A MONOFILAMENT DRAW RATE OF AT LEAST 50 FEET PER MINUTE, THE STEP WHICH COMPRISES HEATING ETHYLENE TO A TEMPERATURE BETWEEN 140*C. AND 250*C. AND UNDER A PRESSURE BETWEEN 800 AND 2,000 ATMOSPHERES IN THE PRESENCE OF A FREE RADICAL-PRODUCING ETHYLENE POLYMERIZATION CATALYST AND FROM 2 TO 20% BY WEIGHT OF PROPANE BASED ON THE ETHYLENE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |