Patent US3700544A successfully refreshed from Google Patents.
US3700544A
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US
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Composite sheath-core filaments having improved flexural rigidity
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1965-07-29
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Granted: 1972-10-24
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Expires: 1985-07-29
Abstract
Abstract A COMPOSITE FILAMENT OF SYNTHETIC FIBER-FORMING HIGH POLYMER IS MELT-SPUN HAVING TWO DIFFERENT COMPONENTS ARRANGED IN A SHEATH-CORE RELATIONSHIP AND EXHIBITING IMPROVED FLEXURAL RIGIDITY DUE TO AN APPROPRIATE NON-CIRCULAR SHAPE GIVEN TO THE CROSS-SECTION OF THE CORE. THE SHEATH COMPONENT HAS A BETTER DYEABILITY THAN THE COR COMPONENT.
Inventors
- 👤 Masao Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:21
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/34; D01F; D01F8/00; D01F8/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2973
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |