US2790698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of removing impurities from fresh spun polyacrylonitrile gel filaments by directing inert gas bubbles against the filaments
Assignee: Wyeth Holdings LLC
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Filing: 1953-12-09
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Granted: 1957-04-30
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Expires: 1973-12-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Robertson
- 👤 Jr Percival W Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:12
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/06; D01D10/00; D01D10/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS WHICH COMPRISES DIRECTING BUBBLES COMPOSED ESSENTIALLY OF AN INERT GAS AGAINST THE SURFACE OF A CONTINUOUS FRESH SPUN GEL FILAMENT COMPRISING A POLYMERIC ACRYLONITRILE IMPREGNATED WITH AN AQUROUS SALT SOLUTION OF A SPINNING SOLVENT FOR SAID POLYMERIC ACRYLONITRILE UNTIL SOME OF SAID AQUEOUS SALT SOLUTION IS RE-
Claim 2
Dependent Claim
49 words
A PROCESS WHICH COMPRISES DIRECTING BUBBLES COMPOSED ESSENTIALLY OF AN INERT GAS AGAINST THE SURFACE OF A CONTINUOUS FRESH SPUN GEL FILAMENT COMPRISING A POLYMERIC ACRYLONITRILE IMPREGNATED WITH AN AQUROUS SALT SOLUTION OF A SPINNING SOLVENT FOR SAID POLYMERIC ACRYLONITRILE UNTIL SOME OF SAID AQUEOUS SALT SOLUTION IS RE-
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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |