Patent US3089748A successfully refreshed from Google Patents.
US3089748A
Expired / Lapsed
US
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Method of producing polyacrylonitrile filamentary material
Assignee: Wyeth Holdings LLC
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Filing: 1960-04-29
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Granted: 1963-05-14
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Expires: 1980-04-29
Abstract
No abstract record available.
Inventors
- 👤 Allan O Mogensen
- 👤 Robert J Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:59
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/38; D01F11/00; D01F11/04; D01F11/06; D01F6/02; D01F6/18; Y; Y10; Y10S; Y10S8/00; Y10S8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A WET-SPINING METHOD THAT INCLUDES THE STEP OF HEAT-RELAXING ORIENTED, DRIED, POLYACRYLONITRILE, FILAMENTARY MATERIAL HAVING A COLLAPSED STRUCTURE, THE IMPROVEMENT WHICH CONSISTS IN BRINGING INTO CONTACT WITH SAID FILANENTARY MATERIAL AN ACIDIC FLUID MEDIUM COMPRISING WATER AND A REDUCING AGENT COMPRISED OF N OXYGEN-CONTAINING COMPOUND OF SULFUR WHILE THE SAID FLUID MEDIUM IS AT A TEMPERATURE ABOVE 100*C. BUT NOT HIGHER THAN 160*C., THE CONTACT BETWEEN THE SAID FILAMENTARY MATERIAL AND THE SAID FLUID MEDIUM BEING EFFECTED NOT LATER THAN THE AFOREMENTIONED STEP OF HEAT-RELAXING, AND THE PERIOD OF THE SAID CONTACT BEING FROM ONE TO SIXTY MINUTES.
Claim 2
Dependent Claim
99 words
IN A WET-SPINING METHOD THAT INCLUDES THE STEP OF HEAT-RELAXING ORIENTED, DRIED, POLYACRYLONITRILE, FILAMENTARY MATERIAL HAVING A COLLAPSED STRUCTURE, THE IMPROVEMENT WHICH CONSISTS IN BRINGING INTO CONTACT WITH SAID FILANENTARY MATERIAL AN ACIDIC FLUID MEDIUM COMPRISING WATER AND A REDUCING AGENT COMPRISED OF N OXYGEN-CONTAINING COMPOUND OF SULFUR WHILE THE SAID FLUID MEDIUM IS AT A TEMPERATURE ABOVE 100*C. BUT NOT HIGHER THAN 160*C., THE CONTACT BETWEEN THE SAID FILAMENTARY MATERIAL AND THE SAID FLUID MEDIUM BEING EFFECTED NOT LATER THAN THE AFOREMENTIONED STEP OF HEAT-RELAXING, AND THE PERIOD OF THE SAID CONTACT BEING FROM ONE TO SIXTY MINUTES.
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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |