Patent US2748159A successfully refreshed from Google Patents.
US2748159A
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Purification and decolorization of esters
Assignee: Goodyear Tire and Rubber Co
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Filing: 1952-09-08
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Granted: 1956-05-29
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Expires: 1972-09-08
Abstract
No abstract record available.
Inventors
- 👤 Anthony F Finelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:58
CPC Classifications
B; B01; B01J; B01J39/00; C; C07; C07C; C07C67/00; C07C67/48; C07C67/56; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE PROCESS OF PURIFYING AND DECOLORIZING ORGANIC ESTER DERIVATIVES OF A PHTHALIC ACID HAVING MOLECULAR WEIGHTS ABOVE 190, VISCOSITIES ABOVE 9 CENTIPOISES AT 20* C. AND BOILING POINTS ABOVE 150* C. AT 4 MILLIMETERS PRESSURE COMPRISING THE SUCCESSIVE STEPS OF TREATING SAID ESTERS WITH A CATION EXCHANGE MATERIAL UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND THEN WITH A DECOLORIZING MATERIAL.
Claim 2
Dependent Claim
58 words
THE PROCESS OF PURIFYING AND DECOLORIZING ORGANIC ESTER DERIVATIVES OF A PHTHALIC ACID HAVING MOLECULAR WEIGHTS ABOVE 190, VISCOSITIES ABOVE 9 CENTIPOISES AT 20* C. AND BOILING POINTS ABOVE 150* C. AT 4 MILLIMETERS PRESSURE COMPRISING THE SUCCESSIVE STEPS OF TREATING SAID ESTERS WITH A CATION EXCHANGE MATERIAL UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND THEN WITH A DECOLORIZING MATERIAL.
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) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |