US3142701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2:5-dibromoterephthalic acid
Assignee: Imperial Chemical Industries Ltd
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Filing: 1962-03-12
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Granted: 1964-07-28
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Expires: 1982-03-12
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Donald Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:12
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/36; C07C51/363
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF 2:5-DIBROMO TEREPHTHALIC ACIDS WHICH COMPRISES TREATING AN OLEUM SOLUTION OF TEREPHTHALIC ACID WITH 1.7 TO 3.0 ATOMIC PROPORTIONS OF BROMINE FOR EACH MOLECULAR PROPORTION OF TEREPHTHALIC ACID AT A TEMPERATURE OF 50-75*C.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF 2:5-DIBROMO TEREPHTHALIC ACIDS WHICH COMPRISES TREATING AN OLEUM SOLUTION OF TEREPHTHALIC ACID WITH 1.7 TO 3.0 ATOMIC PROPORTIONS OF BROMINE FOR EACH MOLECULAR PROPORTION OF TEREPHTHALIC ACID AT A TEMPERATURE OF 50-75*C.
References Cited (Backward Citations)
DE1078563B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |