US3093683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the transformation of benzene polycarboxylic acids to terephthalic acid
Assignee: Henkel AG and Co KGaA
•
Filing: 1957-01-02
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Granted: 1963-06-11
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Expires: 1977-01-02
Abstract
No abstract record available.
Inventors
- 👤 Raecke Bernhard
- 👤 Blaser Bruno
- 👤 Schirp Hubert
- 👤 Stein Werner
- 👤 Schutt Hartwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/377; C07C51/38; C07C51/41; C07C51/416; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE PROCESS OF PRODUCING TEREPTHALIC ACID FROM BENEZENE POLYCARBOXYLIC ACIDS, OTHER THAN TEREPHTHALIC ACID, WHICH COMPRISES HEATING A MIXTURE OF AN ALKALI METAL SALT OF BENZENE POLYCARBOXYLIC ACID WITH FROM 3 TO 6 CARBOXYL GROUPS IN THE MOLECULE AND AN ALKALI METAL SALT OF A BENZENE CARBOXYL ACID, OTHER THAN TEREPHTHALIC ACID, WITH FROM 1 TO 2 CARBOXYL GROUPS IN THE MOLECULE TO A TEMPERATURE BETWEEN 300*C. AND THE DECOMPOSITION TEMPERATURE OF SAID STARTING MATERIALS AND REACTION PRODUCTS IN THE SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE OF AN INERT GAS UNTIL A SUBSTANTIAL AMOUNT OF AN ALKALI METAL SALT OF TEREPHTHALIC ACID HAS BEEN FORMED, CONVERTING THE ALKALI METAL SALT OF TEREPHTHALIC ACID INTO TEREPHTHALIC ACID AND SEPARATING SAID TEREPHTHALIC ACID FROM THE REACTION MASS.
Claim 2
Dependent Claim
122 words
THE PROCESS OF PRODUCING TEREPTHALIC ACID FROM BENEZENE POLYCARBOXYLIC ACIDS, OTHER THAN TEREPHTHALIC ACID, WHICH COMPRISES HEATING A MIXTURE OF AN ALKALI METAL SALT OF BENZENE POLYCARBOXYLIC ACID WITH FROM 3 TO 6 CARBOXYL GROUPS IN THE MOLECULE AND AN ALKALI METAL SALT OF A BENZENE CARBOXYL ACID, OTHER THAN TEREPHTHALIC ACID, WITH FROM 1 TO 2 CARBOXYL GROUPS IN THE MOLECULE TO A TEMPERATURE BETWEEN 300*C. AND THE DECOMPOSITION TEMPERATURE OF SAID STARTING MATERIALS AND REACTION PRODUCTS IN THE SUBSTANTIALLY OXYGEN-FREE ATMOSPHERE OF AN INERT GAS UNTIL A SUBSTANTIAL AMOUNT OF AN ALKALI METAL SALT OF TEREPHTHALIC ACID HAS BEEN FORMED, CONVERTING THE ALKALI METAL SALT OF TEREPHTHALIC ACID INTO TEREPHTHALIC ACID AND SEPARATING SAID TEREPHTHALIC ACID FROM THE REACTION MASS.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |