US2803670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyhalo phenols
Assignee: Ringwood Chemical Corp
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Filing: 1956-08-01
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Granted: 1957-08-20
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Expires: 1976-08-01
Abstract
No abstract record available.
Inventors
- 👤 Galat Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/64; C07C37/01; C07C37/02; C07C37/055; C07C69/00; C07C69/66; C07C69/67; C07C69/708; C07C69/712
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE PROCESS OF PREPARING 2,4,5-TRICHLOROPHENOL, COMPRISING FORMING A MIXTURE OF AN ALKALI METAL HYDROXIDE, A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF GLYCOL AND PROPYLENE GLYCOL, 1,2,4,5-TETRACHLOROBENZENE AND AN ENTRAINING AGENT, SAID ENTRAINING AGENT BEING UNREACTIVE WITH THE OTHER COMPOUNDS OF SAID MIXTURE, SAID MIXTURE BEING FURTHER CHARACTERIZED BY THE FACT THAT THE WEIGHT OF POLYHYDRIC ALCOHOL THEREIN IS FROM 0.5 TO 1.25 TIMES THE WEIGHT OF 1,2,4,5-TETRACHLOROBENZENE THEREIN, HEATING SAID MIXTURE WITH REMOVAL OF ENTRAINING AGENT AND WATER ENTRAINED THEREBY, CONTINUING HEATING THE RESULTING ANHYDROUS REACTION MIXTURE FOR A TIME SUFFICIENT TO HYDROLYZE A CHLORINE ATOM OF SAID 1,2,4,5-TETRACHLOROBENZENE AND RECOVERING 2,4,5-TRICHLOROPHENOL FROM THE RESULTING REACTION MIXTURE.
Claim 2
Dependent Claim
109 words
THE PROCESS OF PREPARING 2,4,5-TRICHLOROPHENOL, COMPRISING FORMING A MIXTURE OF AN ALKALI METAL HYDROXIDE, A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF GLYCOL AND PROPYLENE GLYCOL, 1,2,4,5-TETRACHLOROBENZENE AND AN ENTRAINING AGENT, SAID ENTRAINING AGENT BEING UNREACTIVE WITH THE OTHER COMPOUNDS OF SAID MIXTURE, SAID MIXTURE BEING FURTHER CHARACTERIZED BY THE FACT THAT THE WEIGHT OF POLYHYDRIC ALCOHOL THEREIN IS FROM 0.5 TO 1.25 TIMES THE WEIGHT OF 1,2,4,5-TETRACHLOROBENZENE THEREIN, HEATING SAID MIXTURE WITH REMOVAL OF ENTRAINING AGENT AND WATER ENTRAINED THEREBY, CONTINUING HEATING THE RESULTING ANHYDROUS REACTION MIXTURE FOR A TIME SUFFICIENT TO HYDROLYZE A CHLORINE ATOM OF SAID 1,2,4,5-TETRACHLOROBENZENE AND RECOVERING 2,4,5-TRICHLOROPHENOL FROM THE RESULTING REACTION MIXTURE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |