US2802858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phthalic esters of improved color and method
Assignee: Sherwin Williams Co
•
Filing: 1954-04-14
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Granted: 1957-08-13
•
Expires: 1974-04-14
Abstract
No abstract record available.
Inventors
- 👤 Stack Aaron
- 👤 Earl G Shaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:05
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C67/00; C07C67/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE PROCESS OF ESTERIFICATION OF PHTHALIC ANHYDRIDE WITH MONO-ALCOHOLS INSOLUBLE IN WATER CONTAINING NOT MORE THAN ABOUT 18 CARBON ATOMS UNDER REFLUXING SOLVENT AT ATMOSPHERIC PRESSURE AND BELOW TO PRODUCE PLASTICIZINGNG ESTERS, THE IMPROVEMENT IN PROCESS WHICH COMPRISES THEE ADDITION, PRIOR TO ESTERIFICATION, OF A QUANTITY OF WATER TOO THE REACTANT MIXTURE OF IN EXCESS OF 5% BUT NOT MORE THAN ABOUT 30% BASED ON THE PHTHALIC ACID BUT SUFFICIENTT TO ENHANCE THE ACHROMATIC CHARACTERISTICS OF THE RESULTANT ESTER PRODUCED AND COMPLETING THE SAID ESTERIFICATION REACTION BY REMOVAL OF ADDED WATER AND WATER OF REACTION.
Claim 2
Dependent Claim
96 words
IN THE PROCESS OF ESTERIFICATION OF PHTHALIC ANHYDRIDE WITH MONO-ALCOHOLS INSOLUBLE IN WATER CONTAINING NOT MORE THAN ABOUT 18 CARBON ATOMS UNDER REFLUXING SOLVENT AT ATMOSPHERIC PRESSURE AND BELOW TO PRODUCE PLASTICIZINGNG ESTERS, THE IMPROVEMENT IN PROCESS WHICH COMPRISES THEE ADDITION, PRIOR TO ESTERIFICATION, OF A QUANTITY OF WATER TOO THE REACTANT MIXTURE OF IN EXCESS OF 5% BUT NOT MORE THAN ABOUT 30% BASED ON THE PHTHALIC ACID BUT SUFFICIENTT TO ENHANCE THE ACHROMATIC CHARACTERISTICS OF THE RESULTANT ESTER PRODUCED AND COMPLETING THE SAID ESTERIFICATION REACTION BY REMOVAL OF ADDED WATER AND WATER OF REACTION.
References Cited (Backward Citations)
US2147488A
Cited
US2459014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |