US2943082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer purification and solvent recovery process
Assignee: Phillips Petroleum Co
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Filing: 1954-11-08
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Granted: 1960-06-28
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Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 John E Cottle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:04
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A PROCESS WHEREIN AN ALIPHATIC 1-OLEFIN HAVING A MAXIMUM CHAIN LENGTH OF 8 CARBON ATOMS AND NO CHAIN BRANCHING NEARER THE DOUBLE BOND THAN THAN THE 4-POSITION IS CONVERTED TO NORMALLY SOLID POLYMER BY POLYMERIZATION IN A POLYMERIZATION ZONE IN THE PRESENCE OF A CHROMIUM OXIDE POLYMERIZATION CATALYST AND A HYDROCARBON WHICH IS INERT UNDER THE POLYMERIZATION CONDITIONS AND IS A SOLVENT FOR THE RESULTING POLYMER, THE IMPROVEMENT WHICH COMPRISES VAPORIZING MOST OF SAID SOLVENT FROM SAID POLYMER AND SUBJECTING THE UNVAPORIZED MATERIAL TO SOLVENT VAPORIZATION CONDITIONS IN A GASEOUS STREAM OF SAID OLEFIN, RECOVERING SAID OLEFIN AND SAID SOLVENT IN ADMIXTURE,
Claim 2
Dependent Claim
103 words
IN A PROCESS WHEREIN AN ALIPHATIC 1-OLEFIN HAVING A MAXIMUM CHAIN LENGTH OF 8 CARBON ATOMS AND NO CHAIN BRANCHING NEARER THE DOUBLE BOND THAN THAN THE 4-POSITION IS CONVERTED TO NORMALLY SOLID POLYMER BY POLYMERIZATION IN A POLYMERIZATION ZONE IN THE PRESENCE OF A CHROMIUM OXIDE POLYMERIZATION CATALYST AND A HYDROCARBON WHICH IS INERT UNDER THE POLYMERIZATION CONDITIONS AND IS A SOLVENT FOR THE RESULTING POLYMER, THE IMPROVEMENT WHICH COMPRISES VAPORIZING MOST OF SAID SOLVENT FROM SAID POLYMER AND SUBJECTING THE UNVAPORIZED MATERIAL TO SOLVENT VAPORIZATION CONDITIONS IN A GASEOUS STREAM OF SAID OLEFIN, RECOVERING SAID OLEFIN AND SAID SOLVENT IN ADMIXTURE,
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) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |