Patent US510359A successfully refreshed from Google Patents.
US2812366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in the preparation of polychlorophenols
Assignee: Diamond Shamrock Corp
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Filing: 1954-04-02
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Granted: 1957-11-05
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Expires: 1974-04-02
Abstract
No abstract record available.
Inventors
- 👤 Rosen Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:38
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/02; C07C37/055; C07C37/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF PREPARING PENTACHLOROPHENOL BY THE ALKALINE HYDROLYSIS OF HEXACHLOROBENZENE, SAID METHOD COMPRISING THE STEPS OF REACTING A MIXTURE CONSISTING ESSENTIALLY OF HEXACHLOROBENZENE, A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF METHYL ALCOHOL AND ETHYL ALCOHOL, AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND NAOH.NA2SO4.NACI TRIPLE SALT, EVAPORATING SAID ALCOHOL FROM THE PRODUCT OF SAID HYDROLYSIS, DISSOLVING THE RESIDUE IN WATER, REMOVING INSOLUBLE MATERIAL FROM THE RESULTANT WATER SOLUTION, PARTIALLY ACIDIFYING SAID SOLUTION TO EFFECT PRECIPITATION OF A MAJOR PROPORTION, BUT NOT ALL, OF SAID PENTACHLOROPHENOL AND FILTERING THE THUS-OBTAINED SOLUTION TO OBTAIN THEREFROM SUBSTANTIALLY PURE PENTACHLOROPHENOL.
Claim 2
Independent Claim
103 words
THE METHOD OF PREPARING PENTACHLOROPHENOL BY THE ALKALINE HYDROLYSIS OF HEXACHLOROBENZENE, SAID METHOD COMPRISING THE STEPS OF REACTING A MIXTURE CONSISTING ESSENTIALLY OF HEXACHLOROBENZENE, A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF METHYL ALCOHOL AND ETHYL ALCOHOL, AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND NAOH.NA2SO4.NACI TRIPLE SALT, EVAPORATING SAID ALCOHOL FROM THE PRODUCT OF SAID HYDROLYSIS, DISSOLVING THE RESIDUE IN WATER, REMOVING INSOLUBLE MATERIAL FROM THE RESULTANT WATER SOLUTION, PARTIALLY ACIDIFYING SAID SOLUTION TO EFFECT PRECIPITATION OF A MAJOR PROPORTION, BUT NOT ALL, OF SAID PENTACHLOROPHENOL AND FILTERING THE THUS-OBTAINED SOLUTION TO OBTAIN THEREFROM SUBSTANTIALLY PURE PENTACHLOROPHENOL.
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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |