Patent US3388149A successfully refreshed from Google Patents.
US3388149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of 2, 5-diarylamino-3, 6-dihydroterephthalic esters
Assignee: Honeywell International Inc
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Filing: 1964-01-30
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Granted: 1968-06-11
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Expires: 1984-01-30
Abstract
No abstract record available.
Inventors
- 👤 Dien Chi Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:11
CPC Classifications
C; C09; C09B; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR THE OXIDATION OF 2,5-DIARYLAMINO-3,6DIHYDROTEREPHTHALIC ESTER, TO 2,5-DIARYLAMINO-3,6-TEREPHTHALIC ESTERS WHICH COMPRISES CONTACTING THE ESTER WITH AN AROMATIC, WATER INSOLUBE NITRO COMPOUND HAVING A MELTING POINT OF AT LEAST 25*C. WHEREIN SAID NITRO COMPOUND IS PRESENT IN AN AMOUNT TO PROVIDE AT LEAST 2/3 MOLAR EQUIVALENT OF NITRO GROP PER MOL OF ESTER.
Claim 2
Dependent Claim
54 words
A PROCESS FOR THE OXIDATION OF 2,5-DIARYLAMINO-3,6DIHYDROTEREPHTHALIC ESTER, TO 2,5-DIARYLAMINO-3,6-TEREPHTHALIC ESTERS WHICH COMPRISES CONTACTING THE ESTER WITH AN AROMATIC, WATER INSOLUBE NITRO COMPOUND HAVING A MELTING POINT OF AT LEAST 25*C. WHEREIN SAID NITRO COMPOUND IS PRESENT IN AN AMOUNT TO PROVIDE AT LEAST 2/3 MOLAR EQUIVALENT OF NITRO GROP PER MOL OF ESTER.
References Cited (Backward Citations)
US3285952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |