US2823229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of terephthalic acid
Assignee: Henkel AG and Co KGaA
•
Filing: 1956-06-20
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Granted: 1958-02-11
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Expires: 1976-06-20
Abstract
No abstract record available.
Inventors
- 👤 Raecke Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:41
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/41; C07C51/416
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN A PROCESS OF PRODUCING AROMATIC MONOCYCLIC DICARBOXYLIC ACIDS FROM AROMATIC MONOCYCLIC MONOCARBOXYLIC ACIDS, THE STEPS COMPRISING CONVERTING SAID MONOCYCLIC MONOCARBOXYLIC ACIDS INTO POTASSIUM SALTS THEREOF, AND HEATING SAID POTASSIUM SALTS IN A SUBSTANTIALLY OXYGENFREE INERT ATMOSPHERE TO A TEMPERATURE ABOVE ABOUT 340* C. AND BELOW THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE STARTING MATERIAL TAKES PLACE TO NITRODUCE A SECOND POTASSIUM CARBOXYLIC GROUP INTO SAID POTASSIUM MONOCYCLIC MONOCARBOXYLIC ACID SALTS.
Claim 2
Dependent Claim
72 words
IN A PROCESS OF PRODUCING AROMATIC MONOCYCLIC DICARBOXYLIC ACIDS FROM AROMATIC MONOCYCLIC MONOCARBOXYLIC ACIDS, THE STEPS COMPRISING CONVERTING SAID MONOCYCLIC MONOCARBOXYLIC ACIDS INTO POTASSIUM SALTS THEREOF, AND HEATING SAID POTASSIUM SALTS IN A SUBSTANTIALLY OXYGENFREE INERT ATMOSPHERE TO A TEMPERATURE ABOVE ABOUT 340* C. AND BELOW THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE STARTING MATERIAL TAKES PLACE TO NITRODUCE A SECOND POTASSIUM CARBOXYLIC GROUP INTO SAID POTASSIUM MONOCYCLIC MONOCARBOXYLIC ACID SALTS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |