US2649481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of dialkyl amides from polyacrylonitrile spinning baths
Assignee: Eastman Kodak Co
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Filing: 1951-05-12
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Granted: 1953-08-18
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Expires: 1971-05-12
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS OF RECOVERING A LOWER DIALKYL AMIDE OF A LOWER FATTY ACID FROM AN AQUEOUS SPINNING BATH INTO WHICH A SOLUTION OF POLYACRYLONITRILE IN THE DIALKYL AMIDE HAS BEEN SPUN, WHICH COMPRISES EXTRACTING THE DIALKYL AMIDE WITH AN ALIPHATIC MONOHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF THE BUTYL ALCOHOLS AND THE AMYL ALCOHOLS, AND DISTILLING OFF THE ALCOHOL.
Claim 2
Dependent Claim
60 words
A PROCESS OF RECOVERING A LOWER DIALKYL AMIDE OF A LOWER FATTY ACID FROM AN AQUEOUS SPINNING BATH INTO WHICH A SOLUTION OF POLYACRYLONITRILE IN THE DIALKYL AMIDE HAS BEEN SPUN, WHICH COMPRISES EXTRACTING THE DIALKYL AMIDE WITH AN ALIPHATIC MONOHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF THE BUTYL ALCOHOLS AND THE AMYL ALCOHOLS, AND DISTILLING OFF THE ALCOHOL.
References Cited (Backward Citations)
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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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |