Patent US2662093A successfully refreshed from Google Patents.
US2662093A
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Process of preparing monomeric glycol terephthalates
Assignee: EIDP Inc
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Filing: 1951-09-28
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Granted: 1953-12-08
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Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Harry R Billica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82; C07C67/00; C07C67/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN THE PROCESS WHICH COMPRISES REACTING A GLYCOL OF THE FORMULA, HO(CH2)NOH, WHERE "N" IS AN INTEGER FROM 2 TO 10 INCLUSIVE, WITH AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP UNDER CONDITIONS TO EFFECT ESTER INTERCHANGE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTER TERCHANGE IN THE PRESENCE OF A CATALYST FROM THE GROUP CONSISTING OF LITHIUM HYDRIDE, SODIUM HYDRIDE, AND CALCIUM HYDRIDE.
Claim 2
Dependent Claim
72 words
IN THE PROCESS WHICH COMPRISES REACTING A GLYCOL OF THE FORMULA, HO(CH2)NOH, WHERE "N" IS AN INTEGER FROM 2 TO 10 INCLUSIVE, WITH AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP UNDER CONDITIONS TO EFFECT ESTER INTERCHANGE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTER TERCHANGE IN THE PRESENCE OF A CATALYST FROM THE GROUP CONSISTING OF LITHIUM HYDRIDE, SODIUM HYDRIDE, AND CALCIUM HYDRIDE.
References Cited (Backward Citations)
GB623669A
Cited
US2558547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |