US2856331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dehydrating methyl chloride, and mixtures of methyl chloride with lower aliphatic alcohols
Assignee: Celanese Corp
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Filing: 1954-07-14
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Granted: 1958-10-14
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Expires: 1974-07-14
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Rosenthal
- 👤 Harold K Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:29
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
PROCESS FOR THE DEHYDRATION OF SOLVENTS COMPRISING METHYLENE CHLORIDE WITH A LOWER ALIPHATIC ALCOHOL TOGETHER WITH SUFFICIENT WATER TO CAUSE THE MIXTURE TO SEPARATE INTO TWO PHASES, WHICH COMPRISES SEPARATING THE UPPER AQUEOUS PHASE FROM THE LOWER METHYLENE CHLORIDE PHASE, DISTILLING THE UPPER AQUEOUS PHASE WHEREBY AN AZEOTROPE OF METHYLENE CHLORIDE AND WATER WILL DISTILL OVERHEAD INITIALLY, AND CONTINUING THE DISTILLATION WHEREBY THE ALCOHOL WILL DISTILL OVERHEAD.
Claim 2
Dependent Claim
67 words
PROCESS FOR THE DEHYDRATION OF SOLVENTS COMPRISING METHYLENE CHLORIDE WITH A LOWER ALIPHATIC ALCOHOL TOGETHER WITH SUFFICIENT WATER TO CAUSE THE MIXTURE TO SEPARATE INTO TWO PHASES, WHICH COMPRISES SEPARATING THE UPPER AQUEOUS PHASE FROM THE LOWER METHYLENE CHLORIDE PHASE, DISTILLING THE UPPER AQUEOUS PHASE WHEREBY AN AZEOTROPE OF METHYLENE CHLORIDE AND WATER WILL DISTILL OVERHEAD INITIALLY, AND CONTINUING THE DISTILLATION WHEREBY THE ALCOHOL WILL DISTILL OVERHEAD.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |