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US3760010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of 2,4,5-trichlorophenol
Assignee: Dow Chemical Co
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Filing: 1970-07-30
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Granted: 1973-09-18
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Expires: 1990-07-30
Abstract
Abstract 2,4,5-Trichlorophenol containing methoxyphenol impurities is purified by reacting the crude material with aqueous chromic acid and separating the purified product.
Inventors
- 👤 A Widiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:11
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the crude 2,4,5-trichlorophenol is simultaneously reacted with a second oxidizing agent.
Claim 2
Dependent Claim
17 words
The process of claim 2 wherein the second oxidizing agent is oxygen, air, ozone or potassium permanganate.
References Cited (Backward Citations)
US2925361A
Cited
US3499045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |