Patent US3853687A successfully refreshed from Google Patents.
US3853687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified synthetic fibers and a process for the manufacture of same
Assignee: Asahi Kasei Corp
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Filing: 1971-12-27
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Granted: 1974-12-10
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Expires: 1991-12-27
Abstract
Abstract Synthetic fibers capable of absorbing aqueous medium are manufactured by simultaneously extruding the fiber material and a second material in a core and sheath arrangement. Turbulence is produced in the zone where these two materials combine which results in undulations in their cross-sections. The second material is then dissolved away with a solvent to leave a fiber with an undulating surface. When the second material is extruded as the core, the fiber is hollow with undulations on the inside while when the second material is extruded as the sheath the solid fiber has an undulating outer surface.
Inventors
- 👤 T Ishikawa
- 👤 T Kusunose
- 👤 M Sakashita
- 👤 A Okamoto
- 👤 K Yamashita
- 👤 N Okubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:02
CPC Classifications
A; A46; A46D; A46D1/00; A46D1/02; A46D1/023; D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2935; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A SYNTHETIC FIBER COMPRISING A CORE PORTION AND A SHEATH PORTION WITH AN INTERGACE BETWEEN SAID CORE AND SAID SHEATH WHICH IS CHARACTERIZED BY EXTRUDED EXTREME IRREGULAR UNDULATIONS WHICH VARY IN CROSS-SECTION ALONG THE ENTIRE LENGTH OF THE FIBER, WHEREIN SAID CORE HAS BEEN REMOVED, LEAVING A HOLLOW SHEATH WITH SAID EXTREME IRREGULAR UNDULATIONS ON THE INTERNAL SURFACE THEREOF.
Claim 2
Dependent Claim
59 words
A SYNTHETIC FIBER COMPRISING A CORE PORTION AND A SHEATH PORTION WITH AN INTERGACE BETWEEN SAID CORE AND SAID SHEATH WHICH IS CHARACTERIZED BY EXTRUDED EXTREME IRREGULAR UNDULATIONS WHICH VARY IN CROSS-SECTION ALONG THE ENTIRE LENGTH OF THE FIBER, WHEREIN SAID CORE HAS BEEN REMOVED, LEAVING A HOLLOW SHEATH WITH SAID EXTREME IRREGULAR UNDULATIONS ON THE INTERNAL SURFACE THEREOF.
Claim 3
Dependent Claim
29 words
A synthetic fiber as set forth in claim 1 wherein said hollow sheath is provided with randomly disposed passages communicating the interior of the hollow sheath with ambient atmosphere.
Claim 4
Dependent Claim
37 words
An indefinite length synthetic fiber having a central hollow portion along its longitudinal axis and extruded irregular undulations on the internal surface thereof, said extruded irregular undulations varying in cross-section along the entire length of the fiber.
Claim 5
Dependent Claim
37 words
An indefinite length synthetic fiber having a central hollow portion along its longitudinal axis and extruded irregular undulations on the internal surface thereof, said extruded irregular undulations varying in cross-section along the entire length of the fiber.
Claim 6
Dependent Claim
27 words
The synthetic fiber of claim 3 wherein passages communicate said central hollow portion with the ambient atmosphere at random locations along the axial length of the fiber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |