US3836616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing fibers having porous structures
Assignee: Wyeth Holdings LLC
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Filing: 1973-07-09
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Granted: 1974-09-17
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Expires: 1993-07-09
Abstract
Abstract THERE ARE DISCLOSED IMPROVEMENTS IN THE PROCESS OF PREPARING POROUS FIBERS BY WET-SPINNING A SPINNING COMPOSITION CONTAINING DISPERSED GAS, THE IMPROVEMENTS INCLUDING PREPARATION OF SPINNING SOLUTIONS SATISFYING SPECIFIC MATHEMATIC RELATIONSHIPS AS TO SURFACE TENSION AND VISCOSITY W6THEREOF AND AS TO RELATIVE VOLUME OF SOLUTION AND GAS AS WELL AS LIMITING PARTICLE SIZE OF THE DISPERSED GAS BUBBLES.
Inventors
- 👤 T Kobashi
- 👤 N Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:58
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; D01D5/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |