Patent US2581124A successfully refreshed from Google Patents.
US2936320A
Expired / Lapsed
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Diesters of mixed aromatic dibasic acids
Assignee: California Research LLC
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Filing: 1957-06-24
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Granted: 1960-05-10
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Expires: 1977-06-24
Abstract
No abstract record available.
Inventors
- 👤 Jr George J Benoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
DIALKYL DIESTERS OF MIXTURES OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID IN WHICH THE ALKYL ESTERIFYING GROUPS ARE DERIVED FROM A MIXTURE OF FROM 2 TO 5 ALIPHATIC ALCOHOLS OF 8 CARBON ATOMS EACH SAID MIXTURE CONTAINING FROM 10 TO 90% BY WEIGHT OF EACH ALCOHOL AND THE MIXTURES OF ACID CONTAIN FROM 50 TO 99% BY WEIGHT OF ISOPHTHALIC ACID AND FROM 1 TO 50% BY WEIGHT OF TEREPHTHALIC ACID.
Claim 2
Dependent Claim
70 words
DIALKYL DIESTERS OF MIXTURES OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID IN WHICH THE ALKYL ESTERIFYING GROUPS ARE DERIVED FROM A MIXTURE OF FROM 2 TO 5 ALIPHATIC ALCOHOLS OF 8 CARBON ATOMS EACH SAID MIXTURE CONTAINING FROM 10 TO 90% BY WEIGHT OF EACH ALCOHOL AND THE MIXTURES OF ACID CONTAIN FROM 50 TO 99% BY WEIGHT OF ISOPHTHALIC ACID AND FROM 1 TO 50% BY WEIGHT OF TEREPHTHALIC ACID.
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) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |