US3293233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing ethylene at high pressures in the presence of a mixture of peroxides having different half lives
Assignee: Dart Industries Inc
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Filing: 1963-04-09
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Granted: 1966-12-20
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Expires: 1983-04-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Michael Erchak
- 👤 Kenneth W Doak
- 👤 Robert M Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:45
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR POLYMERIZING ETHYLENE IN A TUBULAR REACTOR AT PRESSURES OF AT LEAST 15,000 P.S.I. AND AT TEMPERATURES WHICH RISE, DUE AT LEAST IN PART TO THE HEAT GENERATED BY THE POLYMERIZATION REACTION, FROM ABOUT 225* F. TO AS HIGH AS 600*F., SAID TUBULAR REACTOR CONTAINING ALONG THE LENGTH THEREOF AT LEAST FIRST AND SECOND SPACED APART PEROXIDE INITIATOR INTRODUCTION POINTS, THE ETHYLENE BEING CONTINUOUSLY INTRODUCED AT ONE END OF THE REACTOR, SAID PROCESS COMPRISING CONTINUOUSLY INTRODUCING A FIRST MIXTURE OF AT LEAST THREE PEROXIDE INITATORS AT THE FIRST INTRODUCTION POINT TO CAUSE A FIRST POLYMERIZATION TEMPERAPEROXIDE INITIATORS AT THE SECOND INTRODUCTION POINT TO CAUSE A SECOND POLYMERIZATION TEMPERATURE CURVE RISE, SAID FIRST MIXTURE OF INITIATORS HAVING A MAJOR PROPORTION
Claim 2
Dependent Claim
121 words
A PROCESS FOR POLYMERIZING ETHYLENE IN A TUBULAR REACTOR AT PRESSURES OF AT LEAST 15,000 P.S.I. AND AT TEMPERATURES WHICH RISE, DUE AT LEAST IN PART TO THE HEAT GENERATED BY THE POLYMERIZATION REACTION, FROM ABOUT 225* F. TO AS HIGH AS 600*F., SAID TUBULAR REACTOR CONTAINING ALONG THE LENGTH THEREOF AT LEAST FIRST AND SECOND SPACED APART PEROXIDE INITIATOR INTRODUCTION POINTS, THE ETHYLENE BEING CONTINUOUSLY INTRODUCED AT ONE END OF THE REACTOR, SAID PROCESS COMPRISING CONTINUOUSLY INTRODUCING A FIRST MIXTURE OF AT LEAST THREE PEROXIDE INITATORS AT THE FIRST INTRODUCTION POINT TO CAUSE A FIRST POLYMERIZATION TEMPERAPEROXIDE INITIATORS AT THE SECOND INTRODUCTION POINT TO CAUSE A SECOND POLYMERIZATION TEMPERATURE CURVE RISE, SAID FIRST MIXTURE OF INITIATORS HAVING A MAJOR PROPORTION
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |