Patent US3576931A successfully refreshed from Google Patents.
US3576931A
Expired / Lapsed
US
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Process for producing fibrillated staple fibers
Assignee: Celanese Corp
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Filing: 1967-07-03
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Granted: 1971-04-27
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Expires: 1987-07-03
Abstract
Abstract A PROCESS FOR THE PREPARATION OF STAPLE FIBERS AND THE PRODUCT PRODUCED THEREBY, THE PROCESS INVOLVING EXTRUDING A MIXTURE OF MOLTEN POLYMER AND FOAMING AGENT WHICH IS OR EVOLVES GAS AT EXTRUSION TEMPERATURE, HOT-MELT DRAWING THE EXTRUDATE AT TEMPERATURES ABOVE THE POLYMER''S GLASS TRANSITION TEMPERATURE TO PRODUCE FIBRILLATION AND CUTTING THE FIBROUS-NETWORK INTO BUNDLES OF STAPLE FIBERS CHARACTERIZED BY CROSS-SECTIONS WHICH ARE SUBSTANTIALLY FREE OF TRAPEZOIDAL CONFIGURATIONS.
Inventors
- 👤 Sohinder Nath Chopra
- 👤 Hilaire Marcel Turmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:29
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/125; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/08; Y10S264/47; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |