US2998357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of alkylamines
Assignee: Pennwalt Corp
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Filing: 1959-01-20
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Granted: 1961-08-29
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Expires: 1979-01-20
Abstract
No abstract record available.
Inventors
- 👤 Leslie A Gillette
- 👤 Martin Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:55
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/271; C07C5/2718; C07C5/2721; C07C29/00; C07C29/74; C07C29/76; C07C29/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE SEPARATION OF AN ALKYLAMINE SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYLAMINE AND TRIETHYLAMINE FROM A MIXTURE CONTAINING SAID ALKYLAMINE, ITS CORRESPONDING ALCOHOL AND WATER, THE PROCESS WHICH COMPRISES DISTILLING SAID MIXTURE AT SUBATMOSPHERIC PRESSURE, RECOVERING AN OVERHEAD PRODUCT RICHER IN SAID ALKYLAMINE THAN THE MIXTURE CHARGED, THEN DISTILLING SAID ALKYLAMINE PRODUCT AT SUPERATMOSPHERIC PRESSURE, THEREBY RECOVERING SAID ALKYLAMINE AS A SUBSTANTIALLY ANHYDROUS AND ALCOHOLFREE BOTTOMS PRODUCT.
Claim 2
Dependent Claim
68 words
IN THE SEPARATION OF AN ALKYLAMINE SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYLAMINE AND TRIETHYLAMINE FROM A MIXTURE CONTAINING SAID ALKYLAMINE, ITS CORRESPONDING ALCOHOL AND WATER, THE PROCESS WHICH COMPRISES DISTILLING SAID MIXTURE AT SUBATMOSPHERIC PRESSURE, RECOVERING AN OVERHEAD PRODUCT RICHER IN SAID ALKYLAMINE THAN THE MIXTURE CHARGED, THEN DISTILLING SAID ALKYLAMINE PRODUCT AT SUPERATMOSPHERIC PRESSURE, THEREBY RECOVERING SAID ALKYLAMINE AS A SUBSTANTIALLY ANHYDROUS AND ALCOHOLFREE BOTTOMS 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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |