Patent US2978441A successfully refreshed from Google Patents.
US2978441A
Expired / Lapsed
US
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Polyolefin reactor control
Assignee: Phillips Petroleum Co
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Filing: 1957-05-23
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Granted: 1961-04-04
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Expires: 1977-05-23
Abstract
No abstract record available.
Inventors
- 👤 Fred T Sherk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:23
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN THE POLYMERIZATION OF OLEFINS IN THE PRESENCE OF A DILUENT AND CATALYST IN A SERIES OF VESSELS WHEREIN CATALYST, MONOMER AND DILUENT IS ADDED TO THE FIRST REACTOR OF SAID SERIES AND ADDITIONAL MONOMER AND DILUENT IS ADDED TO EACH SUBSEQUENT REACTOR AND WHEREIN THE HEAT OF REACTION IS REMOVED AT LEAST IN PART FROM EACH REACTOR BY EVAPORATION OF MONOMER, THE IMPROVEMENT COMPRISING MAINTAINING A CONSTANT LIQUID LEVEL IN EACH REACTOR, CONTROLLING THE RATE OF MONOMER INTRODUCTION TO EACH REACTOR DIRECTLY RESPONSIVE TO TEMPERATURE CHANGES IN SAID REACTOR AND THE RATE OF DILUENT INTRODUCTION TO EACH REACTOR DIRECTLY RESPONSIVE TO FLOW OF OVERHEAD GASES FROM SAID REACTOR THEREBY MAINTAINING THE PRODUCTION RATE SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
116 words
IN THE POLYMERIZATION OF OLEFINS IN THE PRESENCE OF A DILUENT AND CATALYST IN A SERIES OF VESSELS WHEREIN CATALYST, MONOMER AND DILUENT IS ADDED TO THE FIRST REACTOR OF SAID SERIES AND ADDITIONAL MONOMER AND DILUENT IS ADDED TO EACH SUBSEQUENT REACTOR AND WHEREIN THE HEAT OF REACTION IS REMOVED AT LEAST IN PART FROM EACH REACTOR BY EVAPORATION OF MONOMER, THE IMPROVEMENT COMPRISING MAINTAINING A CONSTANT LIQUID LEVEL IN EACH REACTOR, CONTROLLING THE RATE OF MONOMER INTRODUCTION TO EACH REACTOR DIRECTLY RESPONSIVE TO TEMPERATURE CHANGES IN SAID REACTOR AND THE RATE OF DILUENT INTRODUCTION TO EACH REACTOR DIRECTLY RESPONSIVE TO FLOW OF OVERHEAD GASES FROM SAID REACTOR THEREBY MAINTAINING THE PRODUCTION RATE SUBSTANTIALLY CONSTANT.
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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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |