Patent US2961430A successfully refreshed from Google Patents.
US2961430A
Expired / Lapsed
US
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Unsaturated polyester preparation under reduced pressure
Assignee: Celanese Corp
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Filing: 1955-11-01
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Granted: 1960-11-22
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Expires: 1975-11-01
Abstract
No abstract record available.
Inventors
- 👤 Davis Sanford
- 👤 Henry P Marshall
- 👤 Richard E Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6828; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
PROCESS FOR THE PRODUCTION OF POLYESTER RESINS, WHICH COMPRISES ESTERIFYING, AT ANY ELEVATED ESTERIFICATION TEMPERATURE, A GLYCOL AND AN A,B-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID OF ABOUT 4 CARBON ATOMS, SAID MIXTURE BEING ONE WHICH, ON REACTION, FORMS A POLYESTER RESIN CONTAINING A,B-ENAL GROUPS, AND DURING SAID ESTERIFICATION SUBJECTING THE HEATED ESTERIFICATION MIXTURE TO A SUBATMOSPHERIC PRESSURE OF 100 TO 650 MM. OF MERCURY ABSOLUTE FOR AT LEAST AN HOUR.
Claim 2
Dependent Claim
68 words
PROCESS FOR THE PRODUCTION OF POLYESTER RESINS, WHICH COMPRISES ESTERIFYING, AT ANY ELEVATED ESTERIFICATION TEMPERATURE, A GLYCOL AND AN A,B-ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID OF ABOUT 4 CARBON ATOMS, SAID MIXTURE BEING ONE WHICH, ON REACTION, FORMS A POLYESTER RESIN CONTAINING A,B-ENAL GROUPS, AND DURING SAID ESTERIFICATION SUBJECTING THE HEATED ESTERIFICATION MIXTURE TO A SUBATMOSPHERIC PRESSURE OF 100 TO 650 MM. OF MERCURY ABSOLUTE FOR AT LEAST AN HOUR.
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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |