US3264170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyacrylonitrile paper and methods for the manufacture thereof
Assignee: Wyeth Holdings LLC
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Filing: 1963-02-01
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Granted: 1966-08-02
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Expires: 1983-02-01
Abstract
No abstract record available.
Inventors
- 👤 John K Magrane
- 👤 Jr Walter F Reynolds
- 👤 David H Rakowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:24
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; D21H5/205; D21H13/00; D21H13/10; D21H13/12; D21H13/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A CONTINUOUS PROCESS FOR THE MANUFACTURE OF PAPER WHEREIN AN AQUEOUS SUSPENSION OF WET-SPUN WET-GEL FIBRILLATED POLYACRYLONTRILE PAPER-MAKING FILAMENTS OF A POLYMER PREDOMINANTLY COMPOSED OF ACRYLONITRILE IS CONTINUOUSLY SHEETED TO FORM A WATER-LAID WEB, AND SAID WEB CONTAINING AT LEAST ABOUT 40% BY WEIGHT OF FREE AND COMBINED WATER AND BEING COMPOSED OF FILAMENTS HAVING A GEL STRUCTURE IS CONTINUOUSLY DRIED AT A TEMPERATURE BETWEEN ABOUT 150*F. AND THE DECOMPOSITION POINT OF THE POLYMER OF WHICH SAID FILAMENTS ARE COMPOSED, THE IMPROVEMENT WHICH COMPRISES SUBSTANTIALLY CONTINUOUSLY MAINTAINING SAID WEB IN AN ATMOSPHERE HAVING AT LEAST 20% RELATIVE HUMIDITY DURING SAID DRYING UNTIL SAID GEL STRUCTURE HAS SUBSTANTIALLY COMPLETELY COLLAPSED.
Claim 2
Dependent Claim
110 words
IN A CONTINUOUS PROCESS FOR THE MANUFACTURE OF PAPER WHEREIN AN AQUEOUS SUSPENSION OF WET-SPUN WET-GEL FIBRILLATED POLYACRYLONTRILE PAPER-MAKING FILAMENTS OF A POLYMER PREDOMINANTLY COMPOSED OF ACRYLONITRILE IS CONTINUOUSLY SHEETED TO FORM A WATER-LAID WEB, AND SAID WEB CONTAINING AT LEAST ABOUT 40% BY WEIGHT OF FREE AND COMBINED WATER AND BEING COMPOSED OF FILAMENTS HAVING A GEL STRUCTURE IS CONTINUOUSLY DRIED AT A TEMPERATURE BETWEEN ABOUT 150*F. AND THE DECOMPOSITION POINT OF THE POLYMER OF WHICH SAID FILAMENTS ARE COMPOSED, THE IMPROVEMENT WHICH COMPRISES SUBSTANTIALLY CONTINUOUSLY MAINTAINING SAID WEB IN AN ATMOSPHERE HAVING AT LEAST 20% RELATIVE HUMIDITY DURING SAID DRYING UNTIL SAID GEL STRUCTURE HAS SUBSTANTIALLY COMPLETELY COLLAPSED.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |