Patent US2833820A successfully refreshed from Google Patents.
US2833820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of isophthalic and terephthalic acids
Assignee: Mid Century Corp
•
Filing: 1957-06-14
•
Granted: 1958-05-06
•
Expires: 1977-06-14
Abstract
No abstract record available.
Inventors
- 👤 Robert B Egbert
- 👤 Brown David
- 👤 Saffer Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:06
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR PREPARING A MEMBER SELECTED FROM A CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID WHICH COMPRISES REACTING A MEMBER OF A CLASS CONSISTING OF META-DIISOPROPYLBENZENE AND PARA-DIISOPROPYLBENZENE WITH MOLECULAR OXYGEN IN THE PRESENCE OF A CATALYTIC AMOUNT OF A MANGANESE SALT OF A MONOCARBOXYLIC ACID CONTAINING 2 TO 10 CARBON ATOMS AND A NONACID ORGANIC LIQUID BOILING IN THE RANGE OF 50 TO 450*C., AND STABLE UNDER THE REACTION CONDITIONS, AND IN THE PRESENCE OF WATER IN AN AMOUNT SUCH THAT THE REACTION MIXTURE IS AT LEAST 10% SATURATED WITH WATER AT A TEMPERATURE IN THE RANG OF 150 TO 275*C., AND AT A PRESSURE IN THE RANGE OF 100 TO 1500 P.S.I.G. SUCH THAT A LIQUID PHASE OF ORGANIC COMPOUND IS MAINTAINED.
Claim 2
Dependent Claim
126 words
A PROCESS FOR PREPARING A MEMBER SELECTED FROM A CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID WHICH COMPRISES REACTING A MEMBER OF A CLASS CONSISTING OF META-DIISOPROPYLBENZENE AND PARA-DIISOPROPYLBENZENE WITH MOLECULAR OXYGEN IN THE PRESENCE OF A CATALYTIC AMOUNT OF A MANGANESE SALT OF A MONOCARBOXYLIC ACID CONTAINING 2 TO 10 CARBON ATOMS AND A NONACID ORGANIC LIQUID BOILING IN THE RANGE OF 50 TO 450*C., AND STABLE UNDER THE REACTION CONDITIONS, AND IN THE PRESENCE OF WATER IN AN AMOUNT SUCH THAT THE REACTION MIXTURE IS AT LEAST 10% SATURATED WITH WATER AT A TEMPERATURE IN THE RANG OF 150 TO 275*C., AND AT A PRESSURE IN THE RANGE OF 100 TO 1500 P.S.I.G. SUCH THAT A LIQUID PHASE OF ORGANIC COMPOUND IS MAINTAINED.
References Cited (Backward Citations)
US1902550A
Cited
US2302462A
Cited
US2276774A
Cited
GB623836A
Cited
US2479067A
Cited
GB681455A
Cited
FR1017881A
Cited
US2578654A
Cited
US2723994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |