Patent US3681189A successfully refreshed from Google Patents.
US3681189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer synthetic filament
Assignee: Kanegafuchi Spinning Co Ltd
•
Filing: 1970-07-23
•
Granted: 1972-08-01
•
Expires: 1990-07-23
Abstract
Abstract SYNTHETIC FILAMENT HAVING A MULTILAYER CONFIGURATION, IN WHICH POLYAMIDE AND/OR POLYESTER EXCLUDING POLYPIVALOLACTONE AND POLYPIVALOLACTONE ARE LAYER-MULTIPLIED IN THE FORM OF A GRAINY, ARCHIPELAGIC OR NEBULOUS CONFIGURATION AT THE CROSS-SECTION OF THE UNITARY FILAMENT, IS MANUFACTURED BY SUBJECTING SAID SPINNING MATERIALS TO AT LEAST 3 TIMES OF "JOINING-DIVIDING IN DIFFERENT PHASE" REPEATEDLY AND THEN EXTRUDING THE LAYER-MULTIPLIED SPINNING MATERIALS FROM ORIFICE ON A SPINNERET. THE SYNTHETIC FILAMENT IS EXCELLENT IN THE ELASTIC PROPERTY AND ANTISTATIC PROPERTY.
Inventors
- 👤 Masao Matsui
- 👤 Susumu Tokura
- 👤 Masahiro Yamabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:07
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; D01D1/065; D01F; D01F8/00; D01F8/04; D01F8/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2935; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |