US2878097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinning of polyacrylonitrile filaments
Assignee: Individual
•
Filing: 1957-08-20
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Granted: 1959-03-17
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Expires: 1977-08-20
Abstract
No abstract record available.
Inventors
- 👤 Halbig Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF PREPARING POLYACRYLONITRILE FILAMENTS COMPRISING EXTRUDING A SUBSTANTIALLY UNHYDROLYZED SPINNING SOLUTION OF POLYACRYLONITRILE IN 56 TO 65% HNO3 THROUGH A SPINNERET INTO A COAGULATION BATH CONSISTING ESSENTIALLY OF AQUEOUS 43-46% HNO3 AND HAVING A TEMPERATURE OF ABOUT +30 TO -10*C. PASSING THE FORMED FILAMENTS SUCCESSIVELY THROUGH WASHING ZONES CONTAINING SEQUENTIALLY DILUTE NITRIC ACID AND WATER, AND DRAWING THE FRESHLY FORMED FILAMENTS ON THEIR TRAVEL FROM THE SPINNERET TO SAID WATER WASHING ZONE AT A RATE OF AT LEAST 400 PERCENT OF THE RATE OF EXTRUSION OF SAID SOLUTION THROUGH SAID SPINNERET.
Claim 2
Independent Claim
93 words
A METHOD OF PREPARING POLYACRYLONITRILE FILAMENTS COMPRISING EXTRUDING A SUBSTANTIALLY UNHYDROLYZED SPINNING SOLUTION OF POLYACRYLONITRILE IN 56 TO 65% HNO3 THROUGH A SPINNERET INTO A COAGULATION BATH CONSISTING ESSENTIALLY OF AQUEOUS 43-46% HNO3 AND HAVING A TEMPERATURE OF ABOUT +30 TO -10*C. PASSING THE FORMED FILAMENTS SUCCESSIVELY THROUGH WASHING ZONES CONTAINING SEQUENTIALLY DILUTE NITRIC ACID AND WATER, AND DRAWING THE FRESHLY FORMED FILAMENTS ON THEIR TRAVEL FROM THE SPINNERET TO SAID WATER WASHING ZONE AT A RATE OF AT LEAST 400 PERCENT OF THE RATE OF EXTRUSION OF SAID SOLUTION THROUGH SAID SPINNERET.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |