US2775599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of n-vinylpyrrolidone-2
Assignee: Schenley Industries Inc
•
Filing: 1952-04-10
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Granted: 1956-12-25
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Expires: 1972-04-10
Abstract
No abstract record available.
Inventors
- 👤 Puetzer Bruno
- 👤 Katz Leon
- 👤 Horwitz Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:54
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
PROCESS FOR THE PRODUCTION OF N-VINYLPYRROLIDONE-2 WHICH COMPRISES HEATING IN THE LIQUID PHASE, AT A TEMPERATURE NOT SUBSTANTIALLY IN EXCESS OF THE BOILING POINT OF BENZENE AND AT ORDINARY ATMOSPHERIC PRESSURE, A SOLUTION IN A SUBSTANTIALLY INERT ORGANIC SOLVENT OF AN N-(BHALOETHYL)-PYRROLIDONE-2 AND A BASIC REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI-METAL AMIDES, POTASSIUM HYDROXIDE AND LOWER ALKOXIDES OF THE ALKALI-METALS, SEPARTING THE SOLVENT FROM THE REACTION MIXTURE, AND RECOVERING N-VINYLPYRROLIDONE-2 BY DISTILLATION AT A SUBATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
78 words
PROCESS FOR THE PRODUCTION OF N-VINYLPYRROLIDONE-2 WHICH COMPRISES HEATING IN THE LIQUID PHASE, AT A TEMPERATURE NOT SUBSTANTIALLY IN EXCESS OF THE BOILING POINT OF BENZENE AND AT ORDINARY ATMOSPHERIC PRESSURE, A SOLUTION IN A SUBSTANTIALLY INERT ORGANIC SOLVENT OF AN N-(BHALOETHYL)-PYRROLIDONE-2 AND A BASIC REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI-METAL AMIDES, POTASSIUM HYDROXIDE AND LOWER ALKOXIDES OF THE ALKALI-METALS, SEPARTING THE SOLVENT FROM THE REACTION MIXTURE, AND RECOVERING N-VINYLPYRROLIDONE-2 BY DISTILLATION AT A SUBATMOSPHERIC PRESSURE.
References Cited (Backward Citations)
CA472296A
Cited
US2153993A
Cited
US2393132A
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US2532573A
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US2591506A
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US2669570A
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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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |