US2768995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating acrylonitrile polymers with aqueous formaldehyde
Assignee: CRYLOR PARIS
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Filing: 1952-01-19
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Granted: 1956-10-30
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Expires: 1972-01-19
Abstract
No abstract record available.
Inventors
- 👤 Mosse Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:07
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/28; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR DIMINISHING THE SOLUBILITY IN DIMETHYLFORMAMIDE OF POLYMERS SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND THE COPOLYMER CONTAINING IN THE POLYMER MOLECULE 95% BY WEIGHT OF ACRYLONITRILE AND 5% OF VINYL DIMETHYLAMINOETHYL OXIDE CHARACTERIZED BY SUBJECTING THE SAID POLYMERS IN A FINELY DIVIDED STATE AND BEFORE SHAPING THEM INTO THE DESIRED PHYSICAL STATE OF A TREATMENT OF AT LEAST 30 MINUTES WITH AN AQUEOUS SOLUTION OF FORMALDEHYDE AT PH BETWEEN 6 AND 7.
Claim 2
Dependent Claim
76 words
A PROCESS FOR DIMINISHING THE SOLUBILITY IN DIMETHYLFORMAMIDE OF POLYMERS SELECTED FROM THE GROUP CONSISTING OF POLYACRYLONITRILE AND THE COPOLYMER CONTAINING IN THE POLYMER MOLECULE 95% BY WEIGHT OF ACRYLONITRILE AND 5% OF VINYL DIMETHYLAMINOETHYL OXIDE CHARACTERIZED BY SUBJECTING THE SAID POLYMERS IN A FINELY DIVIDED STATE AND BEFORE SHAPING THEM INTO THE DESIRED PHYSICAL STATE OF A TREATMENT OF AT LEAST 30 MINUTES WITH AN AQUEOUS SOLUTION OF FORMALDEHYDE AT PH BETWEEN 6 AND 7.
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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |