US2938017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insoluble polymers of vinyl pyrrolidone and process for producing same
Assignee: GAF Chemicals Corp
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Filing: 1956-10-26
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Granted: 1960-05-24
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Expires: 1976-10-26
Abstract
No abstract record available.
Inventors
- 👤 Grosser Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C08F126/00; C08F126/06; C08F226/00; C08F226/06; C08F226/10; C08F26/00; C08F26/06; C08L; C08L39/00; C08L39/04; C08L39/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD OF POLYMERIZING N-VINYL-A-PYRROLIDONE, WHICH COMPRISES HEATING TO A TEMPERATURE OF FROM ABOUT 400*C. TO 200*C. N-VINYL-A-PYRROLIDONE IN THE PRESENCE OF A SMALL AMOUNT OF A CATALYST, CONSISTING ESSENTIALLY OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALINE EARTH METALS, AND THE OXIDES, HYDROXIDES, AND ALKOXIDES OF THESE METALS.
Claim 2
Independent Claim
53 words
A METHOD OF POLYMERIZING N-VINYL-A-PYRROLIDONE, WHICH COMPRISES HEATING TO A TEMPERATURE OF FROM ABOUT 400*C. TO 200*C. N-VINYL-A-PYRROLIDONE IN THE PRESENCE OF A SMALL AMOUNT OF A CATALYST, CONSISTING ESSENTIALLY OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALINE EARTH METALS, AND THE OXIDES, HYDROXIDES, AND ALKOXIDES OF THESE METALS.
References Cited (Backward Citations)
US2665271A
Cited
BE516071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |