US2773047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of spinnable solutions of polyacrylonitrile and related polymerisates
Assignee: Glanzstoff AG
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Filing: 1954-11-17
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Granted: 1956-12-04
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Expires: 1974-11-17
Abstract
No abstract record available.
Inventors
- 👤 Pirot Ernst
- 👤 Hantelmann Eduart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:20
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; D; D01; D01D; D01D1/00; D01D1/02; D01F; D01F6/00; D01F6/02; D01F6/18; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
METHOD OF PREPARING A SOLUTION OF POLYACRYLONITRILE FOR SPINNING WHICH COMPRISES MAINTAINING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE IN THE BOILING STATE UNDER REFLUX AT A PRESSURE OF 100 MM. HG, CONTINUOUSLY INTRODUCING A STREAM OF A COLD DISPERSION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE AND SIMULTANEOUSLY WITHDRAWING AND FILTERING THE SAME TO OBTAIN A FILTRATE FOR SPINNING.
Claim 2
Dependent Claim
56 words
METHOD OF PREPARING A SOLUTION OF POLYACRYLONITRILE FOR SPINNING WHICH COMPRISES MAINTAINING A SOLUTION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE IN THE BOILING STATE UNDER REFLUX AT A PRESSURE OF 100 MM. HG, CONTINUOUSLY INTRODUCING A STREAM OF A COLD DISPERSION OF POLYACRYLONITRILE IN DIMETHYLFORMAMIDE AND SIMULTANEOUSLY WITHDRAWING AND FILTERING THE SAME TO OBTAIN A FILTRATE FOR SPINNING.
References Cited (Backward Citations)
US2404713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |