US2852501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene
Assignee: Monsanto Chemicals Ltd
•
Filing: 1954-10-05
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Granted: 1958-09-16
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Expires: 1974-10-05
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Richard
- 👤 Robert K Stewart
- 👤 John D Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:55
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS FOR EFFECTING THE POLYMERIZATION OF ETHYLENE AT HIGH PRESSURE TO FORM NORMALLY SOLID POLYETHYLENE, WHEREIN ETHYLENE IS CONTINUOUSLY PUMPED THROUGH A SMALL DIAMETER HIGHLY ELONGATED TUBE MAINTAINED AT A REACTION CONDITIONS EFFECTIVE TO PRODUCE A FINAL REACTION MIXTURE OF POLYETHYLENE PLUS UNREACTED ETHYLENE EXITING FROM THE TUBE, THE IMPROVEMENTT WHICH COMPRISES PERIODICALLY AT REGULAR TIME INTERVALS SUBSTANTIALY INSTANTANEOUSLY OPENING WIDE THE OUTLET END OF SAID TUBE TO A LOW PRESSURE TO IMPOSE ON THE FLOWING REACTION
Claim 2
Dependent Claim
79 words
IN A PROCESS FOR EFFECTING THE POLYMERIZATION OF ETHYLENE AT HIGH PRESSURE TO FORM NORMALLY SOLID POLYETHYLENE, WHEREIN ETHYLENE IS CONTINUOUSLY PUMPED THROUGH A SMALL DIAMETER HIGHLY ELONGATED TUBE MAINTAINED AT A REACTION CONDITIONS EFFECTIVE TO PRODUCE A FINAL REACTION MIXTURE OF POLYETHYLENE PLUS UNREACTED ETHYLENE EXITING FROM THE TUBE, THE IMPROVEMENTT WHICH COMPRISES PERIODICALLY AT REGULAR TIME INTERVALS SUBSTANTIALY INSTANTANEOUSLY OPENING WIDE THE OUTLET END OF SAID TUBE TO A LOW PRESSURE TO IMPOSE ON THE FLOWING REACTION
References Cited (Backward Citations)
US2511480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |