US2726233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrogenated polystyrene
Assignee: TDK Micronas GmbH
•
Filing: 1953-04-08
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Granted: 1955-12-06
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Expires: 1973-04-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Warner
- 👤 Donald K Keel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:13
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD FOR PURIFYING HYDROGENATED POLYSTYRENE COMPRISING DISSOLVING A MIXTURE OF POLYSTRENE AND HYDROGENATED POLYSTYRENE IN A CARBOCYCLIC HYDROCARBON SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, METHYLCYCLOHEXANE, AND DECAHYDRONAPHTHALENE TO FORM A SOLUTION, AND TO SAID SOLUTION ADDING A QUANTITY OF A CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE, BUTYLENE OXIDE, AND DIOXANE TO PRECIPITATE THE HYDROGENATED POLYSTYRENE THEREFROM.
Claim 2
Independent Claim
66 words
A METHOD FOR PURIFYING HYDROGENATED POLYSTYRENE COMPRISING DISSOLVING A MIXTURE OF POLYSTRENE AND HYDROGENATED POLYSTYRENE IN A CARBOCYCLIC HYDROCARBON SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, METHYLCYCLOHEXANE, AND DECAHYDRONAPHTHALENE TO FORM A SOLUTION, AND TO SAID SOLUTION ADDING A QUANTITY OF A CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE, BUTYLENE OXIDE, AND DIOXANE TO PRECIPITATE THE HYDROGENATED POLYSTYRENE THEREFROM.
References Cited (Backward Citations)
US2270184A
Cited
US2394761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |