US2666786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terephthalic acid synthesis
Assignee: Uniroyal Inc
•
Filing: 1952-04-24
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Granted: 1954-01-19
•
Expires: 1972-04-24
Abstract
No abstract record available.
Inventors
- 👤 Kulka Marshall
- 👤 Richard H F Manske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:53
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF COVERTING P-XYLYLENE DICHLORIDE TO TEREPHTHALIC ACID WHICH COMPRISES REFLUXING A MIXTURE OF THE P-XYLYLENE DICHLORIDE, NITRIC ACID HAVING A CONCENTRATION OF FROM 70 TO 100%, AND A SATURATED ALIPHATIV MONOCARBOXYLIC ACID HAVING FROM TWO TO SIX CARBON ATOMS PER MOLECULE, SAID LAST-NAMED ACID SERVING TO HOLD THE REACTION INTERMEDIATES IN SOLUTION BY CAUSING PRECIPITATION OF THE TEREPHTHALIC ACID AS FORMED.
Claim 2
Independent Claim
63 words
THE METHOD OF COVERTING P-XYLYLENE DICHLORIDE TO TEREPHTHALIC ACID WHICH COMPRISES REFLUXING A MIXTURE OF THE P-XYLYLENE DICHLORIDE, NITRIC ACID HAVING A CONCENTRATION OF FROM 70 TO 100%, AND A SATURATED ALIPHATIV MONOCARBOXYLIC ACID HAVING FROM TWO TO SIX CARBON ATOMS PER MOLECULE, SAID LAST-NAMED ACID SERVING TO HOLD THE REACTION INTERMEDIATES IN SOLUTION BY CAUSING PRECIPITATION OF THE TEREPHTHALIC ACID AS FORMED.
References Cited (Backward Citations)
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Cited
US1332028A
Cited
US1488730A
Cited
GB655074A
Cited
FR979063A
Cited
US2563820A
Cited
GB644707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |