US2964514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization process
Assignee: Phillips Petroleum Co
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Filing: 1956-09-10
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Granted: 1960-12-13
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Expires: 1976-09-10
Abstract
No abstract record available.
Inventors
- 👤 William L Fawcett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A POLYMERIZATION PROCESS WHICH COMPRISES INITIALLY CONTACTING A FIRST PORTION OF A POLYMERIZABLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND MIXTURES OF ETHYLENE WITH OTHER UNSATURATED HYDROCARBONS WITH A SOLID CATALYST COMPRISING CHROMIUM OXIDE IN WHICH PART OF THE CHROMIUM IS HEXAVALENT IN A LIQUID INERT HYDROCARBON DILUENT AT A TEMPERATURE IN THE RANGE OF ABOUT 250 TO ABOUT 500*F. SO THAT A SUBSTANTIAL PART OF THE POLYMER PRODUCED IS SOLUBLE IN SAID LIQUID HYDROCARBON DILUENT AND WHEREIN THE POLYMER CONCENTRATION DOES NOT EXCEED ABOUT 15 WEIGHT PER CENT AND THEREAFTER COOLING THE SOLUTION TO BELOW THE PRECIPITATION TEMPERATURE OF THE FORMED POLYMER, ADDING A SECOND PORTION OF A POLYMERIZABLE MATERIAL OF THE FOREGOING TYPE AND POLYMERIZING SAME AT A TEMPERATURE IN THE RANGE OF ABOUT 100*F. TO SAID PRECIPITATION TEMPERATURE SO THAT SUBSTANTIALLY ALL OF THE POLYMER PRODUCED IS INSOLUBLE IN SAID LIQUID HYDROCARBON DILUENT.
Claim 2
Dependent Claim
148 words
A POLYMERIZATION PROCESS WHICH COMPRISES INITIALLY CONTACTING A FIRST PORTION OF A POLYMERIZABLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND MIXTURES OF ETHYLENE WITH OTHER UNSATURATED HYDROCARBONS WITH A SOLID CATALYST COMPRISING CHROMIUM OXIDE IN WHICH PART OF THE CHROMIUM IS HEXAVALENT IN A LIQUID INERT HYDROCARBON DILUENT AT A TEMPERATURE IN THE RANGE OF ABOUT 250 TO ABOUT 500*F. SO THAT A SUBSTANTIAL PART OF THE POLYMER PRODUCED IS SOLUBLE IN SAID LIQUID HYDROCARBON DILUENT AND WHEREIN THE POLYMER CONCENTRATION DOES NOT EXCEED ABOUT 15 WEIGHT PER CENT AND THEREAFTER COOLING THE SOLUTION TO BELOW THE PRECIPITATION TEMPERATURE OF THE FORMED POLYMER, ADDING A SECOND PORTION OF A POLYMERIZABLE MATERIAL OF THE FOREGOING TYPE AND POLYMERIZING SAME AT A TEMPERATURE IN THE RANGE OF ABOUT 100*F. TO SAID PRECIPITATION TEMPERATURE SO THAT SUBSTANTIALLY ALL OF THE POLYMER PRODUCED IS INSOLUBLE IN SAID LIQUID HYDROCARBON DILUENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |