US2570291A
Expired / Lapsed
US
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Extractive distillation of methylamines
Assignee: Imperial Chemical Industries Ltd
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Filing: 1947-12-03
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Granted: 1951-10-09
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Expires: 1967-12-03
Abstract
No abstract record available.
Inventors
- 👤 Tyerman William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:29
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06; C07C209/00; C07C209/82; C07C209/84; C07C209/86; C07C211/00; C07C211/01; C07C211/02; C07C211/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE SEPARATION OF DIMETHYLAMINE FROM A MIXTURE OF THE MONO-, DI-, AND TRIFORMS OF THE METHYLAMINES WHICH COMPRISES SUBJECTING THE MIXTURE TO EXTRACTIVE DISTILLATION WITH ANILINE AT A TEMPERATURE WITHIN THE RANGE OF 10* TO 40* C. AT ATMOSPHERIC PRESSURE, TAKING OFF AS A VAPOR THE MONO- AND TRI- FORMS OF METHYLAMINE, AND OBTAINING DIMETHYLAMINE AS A SOLUTION IN ANILINE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE SEPARATION OF DIMETHYLAMINE FROM A MIXTURE OF THE MONO-, DI-, AND TRIFORMS OF THE METHYLAMINES WHICH COMPRISES SUBJECTING THE MIXTURE TO EXTRACTIVE DISTILLATION WITH ANILINE AT A TEMPERATURE WITHIN THE RANGE OF 10* TO 40* C. AT ATMOSPHERIC PRESSURE, TAKING OFF AS A VAPOR THE MONO- AND TRI- FORMS OF METHYLAMINE, AND OBTAINING DIMETHYLAMINE AS A SOLUTION IN ANILINE.
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) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |