US3695992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous aromatic polyamide fiber
Assignee: EIDP Inc
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Filing: 1970-08-26
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Granted: 1972-10-03
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Expires: 1990-08-26
Abstract
Abstract POROUS FIBERS OF AN AROMATIC POLYAMIDE IN WHICH THE VOID VOLUME FOR PORES HAVING PORE DIAMETERS OF 0.12 MICRON OR LESS IS GREATER THAN 0.03 CC./GM., AND THE VOID VOLUME FOR PORES HAVING PORE DIAMETERS OF MORE THAN 0.12 MICRON IS LESS THAN 0.02 CC./GM. SUCH FIBERS ARE PREPARED BY A PROCESS WHEREIN FRESHLY SPUN FIBERS ARE DRAWN AND EXTRACTED IN ONE OR MORE SOLVENT-CONTAINING AQUEOUS BATHS OF SPECIFIED COMPOSITION AND TEMPERATURE, SUBJECTED TO STEAM WHEN THE DRAWING STEP IS CARRIED OUT AT CERTAIN CONDITIONS, AND ARE THEN DRIED. SUCH FIBERS ARE DYEABLE WITHOUT THE USE OF SUPERATMOSPHERIC PRESSURES OR DYEING ASSISTANTS.
Inventors
- 👤 Gordon M Moulds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:46
CPC Classifications
D; D06; D06P; D06P5/00; D06P5/22; D01; D01D; D01D5/00; D01D5/24; D01D5/247; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; Y; Y10; Y10S; Y10S521/00; Y10S521/92; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298; Y10T428/31504; Y10T428/31725
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |