Patent US2728781A successfully refreshed from Google Patents.
US2728781A
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Acyloxy substituted-glycidyl polyethers of dihydric phenols
Assignee: Shell Development Co
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Filing: 1952-03-29
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Granted: 1955-12-27
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Expires: 1972-03-29
Abstract
No abstract record available.
Inventors
- 👤 Edward C Shokal
- 👤 Clayton A May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:11
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/1455; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L63/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
A PROCESS FOR THE PRODUCTION OF AN EPOXY ESTER WHICH COMPRISES HEATING AND REACTING AN ANHYDRIDE OF A HYDROCARBON MONOCARBOXYLIC ACID OF 2 TO 18 CARBON ATOMS WITH GLYCIDYL POLYETHER OF A DIHYDRIC PHENOL, WHICH POLYETHER CONTAINS ALCOHOLIC HYDROXYL GROUPS, UNDER ANHYDROUS CONDITIONS WHILE DISTILLING THE LIBERATED MONOCARBOXYLIC ACID FROM THE REACTION MIXTURE SUBSTANTIALLY AS FAST AS FORMED WHEREBY ESTERIFICATION OF THE ALCOHOLIC HYDROXYL GROUPS IN THE POLYETHER OCCURS WITHOUT APPRECIABLE DESTRUCTION OF THE EPOXIDE GROUPS THEREIN.
Claim 2
Dependent Claim
77 words
A PROCESS FOR THE PRODUCTION OF AN EPOXY ESTER WHICH COMPRISES HEATING AND REACTING AN ANHYDRIDE OF A HYDROCARBON MONOCARBOXYLIC ACID OF 2 TO 18 CARBON ATOMS WITH GLYCIDYL POLYETHER OF A DIHYDRIC PHENOL, WHICH POLYETHER CONTAINS ALCOHOLIC HYDROXYL GROUPS, UNDER ANHYDROUS CONDITIONS WHILE DISTILLING THE LIBERATED MONOCARBOXYLIC ACID FROM THE REACTION MIXTURE SUBSTANTIALLY AS FAST AS FORMED WHEREBY ESTERIFICATION OF THE ALCOHOLIC HYDROXYL GROUPS IN THE POLYETHER OCCURS WITHOUT APPRECIABLE DESTRUCTION OF THE EPOXIDE GROUPS THEREIN.
Claim 3
Dependent Claim
10 words
AN EPOXY OF A MIXTURE OF POLYETHERS OF THE FORMULA
Claim 4
Dependent Claim
10 words
AN EPOXY OF A MIXTURE OF POLYETHERS OF THE FORMULA
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |