US3278657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil recovery in wet-spinning process
Assignee: Celanese Corp
•
Filing: 1962-08-22
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Granted: 1966-10-11
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Expires: 1982-08-22
Abstract
No abstract record available.
Inventors
- 👤 James S Clements
- 👤 Kenneth C Laughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:07
CPC Classifications
C; C10; C10G; C10G31/00; D; D01; D01F; D01F13/00; D01F13/02; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
131 words
THE PROCESS WHICH COMPRISES WET SPINNING A SOLUTION OF CELLULOSE TRIESTER IN A SOLVENT INTO A SPIN BATH EXERTING A SWELLING ACTION THEREON TO FORM SWOLLEN FILAMENTS, CONTACTING THE FRESHLY FORMED SWOLLEN FILAMENTS WITH OIL, COLLECTING EXCESS OIL AND SPENT SPIN BATH AS MIXTURE, SAID MIXTURE COMPRISING SOLVENT, WATER AND FINELY DIVIDED CELLULOSE TRIESTER SOLIDS, EVAPORATING AT LEAST A PORTION OF THE MIXTURE TO REMOVE MOST OF THE SOLVENT THEREFROM AND TO LEAVE EVAPORATOR BOTTOMS CONTAINING CELLULOSE TRIESTER, OIL, SOLVENT AND WATER, EVAPORATING OF FROM SAID BOTTOMS SAID SOLVENT AND WATER TO LEAVE A RESIDUE OF CELLULOSE TRIESTER AND OIL, SEPARATING SAID OIL FROM SAID CELLULOSE TRIESTER, TREATING SAID OIL WITH A DECOLORIZING ADSORBENT TO THEREBY DECOLORIZE SAID OIL, AND RECYCLING SAID OIL FOR FURTHER CONTACT WITH FRESHLY FORMED SWOLLEN FILAMENTS.
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |