Patent US3841338A successfully refreshed from Google Patents.
Patent US3285952A successfully refreshed from Google Patents.
US3285952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of 2, 5-diarylamino-dihydro-terephthalates with nitrobenzene
Assignee: Bayer Corp
•
Filing: 1962-11-20
•
Granted: 1966-11-15
•
Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Chi K Dien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:47
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/2206; C07C5/2226; C07C5/224; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A PROCESS FOR THE OXIDATION OF ESTERS OF 2,5-DIARYLAMINO-DIHYDRO-TEREPHTHALIC ACIDS WHICH COMPRISES HEATING AN ESTER OF 2,5-DIARYLAMINO-DIHYDRO-TEREPHTHALIC ACID WITH NITROBENZENE.
Claim 2
Dependent Claim
20 words
A PROCESS FOR THE OXIDATION OF ESTERS OF 2,5-DIARYLAMINO-DIHYDRO-TEREPHTHALIC ACIDS WHICH COMPRISES HEATING AN ESTER OF 2,5-DIARYLAMINO-DIHYDRO-TEREPHTHALIC ACID WITH NITROBENZENE.
References Cited (Backward Citations)
US3045040A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |