Patent US2777002A successfully refreshed from Google Patents.
US2777002A
Expired / Lapsed
US
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Para-halogenation of phenols
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-04-27
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Granted: 1957-01-08
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 James D Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:49
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
IN THE PROCESS FOR PREPARING PRIMARILY 4-CHLORO-2ALKYLPHENOLS BY THE CHLORINATION OF AN O-ALKYLPHENOL, THE STEPS COMPRISING REACTING AN O-ALKYLPHENOL WITH AT LEAST AN EQUIMOLECULAR EQUIVALENT BUT NOT IN EXCESS OF ABOUT 1.1 MOLES OF SULFURYL CHLORIDE IN THE PRESENCE OF FROM 0.5 TO 2.0% BY WEIGHT OF FERRIC CHLORIDE BASED ON THE PHENOLIC REACTANT, AND AT A TEMPERATURE NOT EXCEEDING ABOUT 75*C.
References Cited (Backward Citations)
US2494993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |