US3812004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naturally crimped textile fibers
Assignee: Wyeth Holdings LLC
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Filing: 1971-04-02
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Granted: 1974-05-21
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Expires: 1991-04-02
Abstract
Abstract A SYNTHETIC TEXTILE FIBER HAVING INCORPORATED THEREIN AT LEAST 1 PERCENT (ON THE WEIGHT OF FIBER) OF SILICA PARTIC;ES OM THE FORM OF ELONGATED AGGREGATIONS HAVING A LENGTHTO-WIDTH RATIO OF AT LEAST 10/1. SUCH FIBERS HAVE IMPROVED ANTI-SOILING PROPERTIES AND, PREFERABLY, ARE NATURALLY CRIMPED. ACRYLONITRILE POLYMERS FIBERS OF THIS TYPE ARE MADE BY FORMING LOOSE AGGREGATES OF SUCH SILICA PARTICLES IN THE SPINNING COMPOSITION PRIOR TO SPINNING. DURING SPINNING, THESE LOOSE AGGREGATES BECOMES ELONGATED.
Inventors
- 👤 S Chinai
- 👤 E Brigmanis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:56
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01D; D01D5/00; D01D5/22; D01F6/00; D01F6/02; D01F6/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2927
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |