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Patent US3247176A successfully refreshed from Google Patents.
US3247176A
Expired / Lapsed
US
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Control of dispersing agent in rubber recovery
Assignee: Phillips Petroleum Co
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Filing: 1961-06-26
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Granted: 1966-04-19
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Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Dean J Veal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:53
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN THE RECOVERY OF RUBBER IN CRUMB FORM FROM A SOLUTION THEREOF IN AN INERT SOLVENT BY STEAM STRIPPING WHEREIN THE RUBBER SOLUTION IS INTRODUCED INTO A STEAM STRIPPING ZONE CONTAINING AN AQUEOUS PHASE, SAID AQUEOUS PHASE CONTAINING AN ALKALI METAL LIGNIN SULFONATE, THE IMPROVEMENT COMPRISING ESSENTIALLY THE STEPS OF REMOVING A SAMPLE OF THE WATER, DIVIDING SAID SAMPLE INTO FIRST AND SECOND HALVES, MAKING THE FIRST HALF ACIDIC BY ADDING A STRONG ACID THERETO, MAKING THE SECOND HALF BASIC BY ADDING A STRONG BASE THERETO, MEASURING THE DIFFERENCE IN ABSORPTION OF LIGHT HAVING A WAVELENGTH OF 353 MILLIMICRONS OF EACH OF SAID HAVLES OF SAID SAMPLE, AND ADJUSTING ALKALI METAL LIGNIN SULFONATE SUPPLIED TO THE STRIPPING ZONE IN RESPONSE TO CHANGES IN CONCENTRATION OF ALKALI METAL LIGNIN SULFONATE IN THE SAMPLE.
Claim 2
Dependent Claim
132 words
IN THE RECOVERY OF RUBBER IN CRUMB FORM FROM A SOLUTION THEREOF IN AN INERT SOLVENT BY STEAM STRIPPING WHEREIN THE RUBBER SOLUTION IS INTRODUCED INTO A STEAM STRIPPING ZONE CONTAINING AN AQUEOUS PHASE, SAID AQUEOUS PHASE CONTAINING AN ALKALI METAL LIGNIN SULFONATE, THE IMPROVEMENT COMPRISING ESSENTIALLY THE STEPS OF REMOVING A SAMPLE OF THE WATER, DIVIDING SAID SAMPLE INTO FIRST AND SECOND HALVES, MAKING THE FIRST HALF ACIDIC BY ADDING A STRONG ACID THERETO, MAKING THE SECOND HALF BASIC BY ADDING A STRONG BASE THERETO, MEASURING THE DIFFERENCE IN ABSORPTION OF LIGHT HAVING A WAVELENGTH OF 353 MILLIMICRONS OF EACH OF SAID HAVLES OF SAID SAMPLE, AND ADJUSTING ALKALI METAL LIGNIN SULFONATE SUPPLIED TO THE STRIPPING ZONE IN RESPONSE TO CHANGES IN CONCENTRATION OF ALKALI METAL LIGNIN SULFONATE IN THE SAMPLE.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |