US2692899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pentachlorophenol
Assignee: Ethyl Corp
•
Filing: 1951-12-27
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Granted: 1954-10-26
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Expires: 1971-12-27
Abstract
No abstract record available.
Inventors
- 👤 Alfred J Kolka
- 👤 William E Burt
- 👤 Henry W Hoftiezer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:10
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/64; C07C37/01; C07C37/02; C07C37/055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD FOR THE PREPARATION OF PENTACHLOROPHCNOL OF HIGH PURITY WHICH COMPRISES HEATING TO A TEMPERATURE ABOVE ABOUT 150* C. A MIXTURE OF HEXACHLOROBENZENE, AN ALKALI METAL HYDROXIDE AND AN ALKANEDIOL CONTAINING FROM 2 TO 6 CARBON ATOMS, THE MOLE RATIO OF THE ALKALI METAL HYDROXIDE AND HEXACHLOROBENZENE BEING BETWEEN ABOUT 2:1 AND 3:1, THE ALKANEDIOL BEING PRESENT IN A QUANTITY SUFFICIENT TO PROVIDE A 5-25 PERCENT SOLUTION BY WEIGHT OF THE HYDROXIDE, AND THEREAFTER ACIDIFYING AND RECOVERING THE PENTACHLOROPHENOL PRODUCT.
Claim 2
Independent Claim
81 words
A METHOD FOR THE PREPARATION OF PENTACHLOROPHCNOL OF HIGH PURITY WHICH COMPRISES HEATING TO A TEMPERATURE ABOVE ABOUT 150* C. A MIXTURE OF HEXACHLOROBENZENE, AN ALKALI METAL HYDROXIDE AND AN ALKANEDIOL CONTAINING FROM 2 TO 6 CARBON ATOMS, THE MOLE RATIO OF THE ALKALI METAL HYDROXIDE AND HEXACHLOROBENZENE BEING BETWEEN ABOUT 2:1 AND 3:1, THE ALKANEDIOL BEING PRESENT IN A QUANTITY SUFFICIENT TO PROVIDE A 5-25 PERCENT SOLUTION BY WEIGHT OF THE HYDROXIDE, AND THEREAFTER ACIDIFYING AND RECOVERING THE PENTACHLOROPHENOL PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |