Patent US3568428A successfully refreshed from Google Patents.
US3568428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheath/core composite yarns
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-02-06
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Granted: 1971-03-09
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Expires: 1989-02-06
Abstract
Abstract A BULKY TENSION-STABLE YARN HAVING STRETCH BROKEN FIBRES AS THE CORE AND CRIMPED STAPLE FIBRES AS SHEATH IS OBTAINED BY BLENDING SILVERS OF THE SAID FIBRES AND DRAFTING AND SPINNING ON A WORSTED SYSTEM.
Inventors
- 👤 Richard Stentiford
- 👤 Alan Roebuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:11
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/36; D10; D10B; D10B2331/00; D10B2331/02
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |