US3595738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helically crimped filamentary materials
Assignee: Imperial Chemical Industries Ltd
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Filing: 1968-05-21
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Granted: 1971-07-27
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Expires: 1988-05-21
Abstract
Abstract DISCLOSED IS A CRIMPED COMPOSITE FILAMENT HAVING A CRIMP INDEX IN THE RANGE OF 40% TO 70% AND 8 TO 25 CRIMPS PER INCH, SAID FILAMENT COMPOSED OF POLYETHYLENE TEREPHTHALATE POLYMERS HAVING DIFFERENT INTRINSIC VISCOSITIES AND HAVING VALUES OF BIREFRINGENCE WHICH DIFFER BY AN AMOUNT WHEREBY THE FACTOR $IV.$BR LIES IN THE RANGE OF 1.9X10**-4 TO 3.3X10**-3 WHERE $IV IS THE DIFFERENCE IN INTRINSIC VISCOSITIES AND $BR IS THE DIFFERENCE IN THE BIREFRINGENCE OF THE TWO COMPONENTS.
Inventors
- 👤 Barry Henson Clarke
- 👤 Geoffrey Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:22
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01F; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |