Patent US2666781A successfully refreshed from Google Patents.
US2666781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of methylal to prevent emulsions in esters during the aqueous wash
Assignee: Standard Oil Development Co
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Filing: 1952-01-30
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Granted: 1954-01-19
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Expires: 1972-01-30
Abstract
No abstract record available.
Inventors
- 👤 Ian A M Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:32
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN A PROCESS FOR THE PREPARATION OF ORGANIC ESTERS OF REDUCED ACIDITY WHICH COMPRISES ESTERIFYING ALIPHATIC ALCOHOLS WITH CARBOXYLIC ACIDS, THE IMPROVEMENT WHICH COMPRISES WASHING THE RESULTANT CRUDE ESTER WITH AN AQUEOUS ALKALI IN THE PRESENCE OF METHYLAL, FURTHER WASHING THE ESTER AT LEAST ONCE WITH WATER, AND SEPARATING THE ESTER FROM ANY RESIDUAL METHYLAL.
Claim 2
Dependent Claim
55 words
IN A PROCESS FOR THE PREPARATION OF ORGANIC ESTERS OF REDUCED ACIDITY WHICH COMPRISES ESTERIFYING ALIPHATIC ALCOHOLS WITH CARBOXYLIC ACIDS, THE IMPROVEMENT WHICH COMPRISES WASHING THE RESULTANT CRUDE ESTER WITH AN AQUEOUS ALKALI IN THE PRESENCE OF METHYLAL, FURTHER WASHING THE ESTER AT LEAST ONCE WITH WATER, AND SEPARATING THE ESTER FROM ANY RESIDUAL METHYLAL.
References Cited (Backward Citations)
FR673703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |