Patent FR2147254A1 successfully refreshed from Google Patents.
US3090778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of powdered polyethylene
Assignee: Monsanto Chemicals Ltd
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Filing: 1962-09-26
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Granted: 1963-05-21
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Expires: 1982-09-26
Abstract
No abstract record available.
Inventors
- 👤 Ehrlich Paul
- 👤 Dennis E Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
B; B29; B29B; B29B9/00; C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR THE PRODUCTION OF ETHYLENE POLYMERS IN POWDERED FORM IN A TUBULAR REACTOR ZONE AT ELEVATED TEMPERATURES AND PRESSURES IN THE PRESENCE OF A FREE-RADICAL-GENERATING INITIATOR FOR THE POLYMERIZATION, SAID PROCESS COMPRISING COOLING THE POLYMERIZATION REACTION MIXTURE IN SAID TUBULAR REACTION ZONE, WITHDRAWING SAID COOLED POLYMERIZATION MIXTURE FROM SAID TUBULAR REACTION ZONE, REDUCING THE PRESSURE OF SAID COOLED POLYMERIZATION MIXTURE AND RECOVERING SAID ETHYLENE POLYMERS IN A POWDERED FORM AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER AS THE PRODUCT OF THE PROCESS.
Claim 2
Dependent Claim
87 words
A PROCESS FOR THE PRODUCTION OF ETHYLENE POLYMERS IN POWDERED FORM IN A TUBULAR REACTOR ZONE AT ELEVATED TEMPERATURES AND PRESSURES IN THE PRESENCE OF A FREE-RADICAL-GENERATING INITIATOR FOR THE POLYMERIZATION, SAID PROCESS COMPRISING COOLING THE POLYMERIZATION REACTION MIXTURE IN SAID TUBULAR REACTION ZONE, WITHDRAWING SAID COOLED POLYMERIZATION MIXTURE FROM SAID TUBULAR REACTION ZONE, REDUCING THE PRESSURE OF SAID COOLED POLYMERIZATION MIXTURE AND RECOVERING SAID ETHYLENE POLYMERS IN A POWDERED FORM AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER AS THE PRODUCT OF THE PROCESS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |