Patent US5327905A successfully refreshed from Google Patents.
US3763299A
Expired / Lapsed
US
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Dry spinning process for hollow acetate fiber
Assignee: FMC Corp
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Filing: 1971-04-19
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Granted: 1973-10-02
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Expires: 1991-04-19
Abstract
Abstract A METHOD OF PREPARING HOLLOW CELLULOSE ACETATE FILAMENTS BY DRY SPINNING AN ACETONE SOLUBLE CELLULOSE ACETATE SOLUTION WHEREIN THE SOLVENT COMPRISES ACETONE HAVING CARBON DISULFIDE DISSOLVED THEREIN. THE SOLUTION IS SPUN UNDER CONVENTIONAL DRY SPINNING CONDITIONS TO PRODUCE HOLLOW FILAMENTS.
Inventors
- 👤 S So
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:00
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B01; B01D; B01D69/00; B01D69/08; D01D7/00; D01D7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |