US3558569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyamide filaments having a high degree of polymerization
Assignee: Teijin Ltd
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Filing: 1968-03-28
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Granted: 1971-01-26
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Expires: 1988-03-28
Abstract
Abstract FIBER-FORMING POLYAMIDES CONTAINING NO MORE THAN ABOUT 0.2% BY WEIGHT WATER ARE MELT-SPUN IN THE PRESENCE OF BETWEEN ABOUT 0.01% BY WEIGHT AND ABOUT 2.0% BY WEIGHT OF AN ALKYL ESTER OF PHOSPHOROUS ACID. THE DWELL TIME, S, IN MINUTES, OF THE POLYAMIDE AT MELT-SPINNING TEMPERATURE T, IN DEGREES CENTIGRADE, IS MAINTAINED WITHIN THE LIMITS OF THE FOLLOWING RELATIONSHIP: THE RESULTING FILAMENTS HAVE A MOLECULAR WEIGHT GREATER THAN THAT OF UNSPUN POLYAMIDE AND EXHIBIT A HIGH DEGREE OF TENSILE STRENGTH AND RESISTANCE TO WET-HEAT.
Inventors
- 👤 Michio Goto
- 👤 Takao Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:08
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; D01F1/00; D01F1/02; D01F1/10
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |