US3558763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating wet spun filaments with shrinking agents
Assignee: Celanese Corp
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Filing: 1965-06-16
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Granted: 1971-01-26
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Expires: 1985-06-16
Abstract
Abstract A METHOD OF TREATING FILAMENTARY MATERIALS FORMED FROM DIFFICULTLY MELTABLE POLYMERS (AMIDE) AND PARTICULARLY TO THE STEP OF RELAXING THE SHAPED WET FORMED FILAMENT BY CONTACTING THE FILAMENT FOR A PERIOD OF TIME AND AT A TEMPERATURE SUFFICIENT TO IMPROVE THE DYE RECEPTIVITY OF THE FIBER WITH A STRONG INORGANIC ACID SHRINKING AGENT OF A SPECIFIED CONCENTRATION. MORE PARTICULARLY, AQUEOUS SOLUTIONS OF SULFURIC ACID, HYDROCHLORIC ACID AND PHOSPHORIC ACID ARE USED AS THE SHRINKING AGENT.
Inventors
- 👤 Richard G Quynn
- 👤 Saunders E Jamison
- 👤 Simon E Sobering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:30
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/72; D01F6/60; D01F6/605
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) | 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 |