US3268501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of polymers from solution
Assignee: Phillips Petroleum Co
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Filing: 1960-12-01
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Granted: 1966-08-23
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Expires: 1980-12-01
Abstract
No abstract record available.
Inventors
- 👤 Willie W Crouch
- 👤 James N Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:28
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PROCESS OF RECOVERING A RUBBERY POLYMER PREPARED BY POLYMERIZING A MONOMER MIXTURE CONTAINING AT LEAST A MAJOR PORTION OF A CONJUGATED DIENE OF 4 TO 8 CARBON ATOMS FROM A SOLUTION OF SAID POLYMER IN A SOLVENT BY STEAM STRIPPING IN THE PRESENCE OF WATER, THE IMPROVEMENT COMPRISING ADDING TO THE STRIPPING ZONE AN ALKALI METAL SALT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKYL SULFATES CONTAINING 8 TO 18 CARBON ATOMS AND ALKYLBENZENE SULFONATES CONTAINING AN ALKYL GROUP OF 8 TO 18 CARBON ATOMS, THE AMOUNT OF SAID SALT BEING 0.01 TO ONE POUND PER 100 POUNDS OF RUBBER CHARGED TO THE STRIPPING ZONE.
Claim 2
Dependent Claim
109 words
IN THE PROCESS OF RECOVERING A RUBBERY POLYMER PREPARED BY POLYMERIZING A MONOMER MIXTURE CONTAINING AT LEAST A MAJOR PORTION OF A CONJUGATED DIENE OF 4 TO 8 CARBON ATOMS FROM A SOLUTION OF SAID POLYMER IN A SOLVENT BY STEAM STRIPPING IN THE PRESENCE OF WATER, THE IMPROVEMENT COMPRISING ADDING TO THE STRIPPING ZONE AN ALKALI METAL SALT OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKYL SULFATES CONTAINING 8 TO 18 CARBON ATOMS AND ALKYLBENZENE SULFONATES CONTAINING AN ALKYL GROUP OF 8 TO 18 CARBON ATOMS, THE AMOUNT OF SAID SALT BEING 0.01 TO ONE POUND PER 100 POUNDS OF RUBBER CHARGED TO THE STRIPPING ZONE.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |