US2622273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for precipitating cellulose acetate
Assignee: Akzo Nobel UK PLC
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Filing: 1948-07-03
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Granted: 1952-12-23
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Expires: 1968-07-03
Abstract
No abstract record available.
Inventors
- 👤 George T Detwiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:24
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22; C08B3/26; C08B3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
APPARATUS FOR PRECIPITATING CELLULOSE ACETATE IN THE FORM OF THIN, SUBSTANTIALLY FLAT POROUS PARTICLES HAVING ROUGH CREPE-LIKE SURFACES FROM ACID DOPE FORMED BY ACETYLATION OF CELLULOSE COMPRISING, IN COMBINATION, A NOZZLE, AN ELONGATED EXTRUSION SLOT HAVING A LENGTH OF FROM ONE-HALF TO ONE AND ONE-HALF INCHES, AND A WIDTH OF FROM ONE-EIGHT TO ONE-FOURTH INCH IN THE NOZZLE, A CHAMBER CONTAINING A BATH OF DILUTE AQUEOUS PRECIPITATING LIQUID, MEANS FOR SUPPORTING THE NOZZLE BELOW THE SURFACE OF THE BATH, MEANS FOR FORCING DOPE THROUGH THE ELONGATED SLOT IN THE NOZZLE INTO THE LIQUID, A CUTTING MEANS ROTATABLY SUPPORTED ADJACENT THE NOZZLE AND POSITIONED SO THAT WHEN IT IS ROTATED THE CUTTING EDGE THEREOF STRIKES AGAINST THE FACE OF THE FLAT STREAM OF DOPE EXTRUDED THROUGH THE SLOT, AND MEANS FOR CONTINUOUSLY AGITATING THE PRECIPITATING LIQUID.
Claim 2
Dependent Claim
135 words
APPARATUS FOR PRECIPITATING CELLULOSE ACETATE IN THE FORM OF THIN, SUBSTANTIALLY FLAT POROUS PARTICLES HAVING ROUGH CREPE-LIKE SURFACES FROM ACID DOPE FORMED BY ACETYLATION OF CELLULOSE COMPRISING, IN COMBINATION, A NOZZLE, AN ELONGATED EXTRUSION SLOT HAVING A LENGTH OF FROM ONE-HALF TO ONE AND ONE-HALF INCHES, AND A WIDTH OF FROM ONE-EIGHT TO ONE-FOURTH INCH IN THE NOZZLE, A CHAMBER CONTAINING A BATH OF DILUTE AQUEOUS PRECIPITATING LIQUID, MEANS FOR SUPPORTING THE NOZZLE BELOW THE SURFACE OF THE BATH, MEANS FOR FORCING DOPE THROUGH THE ELONGATED SLOT IN THE NOZZLE INTO THE LIQUID, A CUTTING MEANS ROTATABLY SUPPORTED ADJACENT THE NOZZLE AND POSITIONED SO THAT WHEN IT IS ROTATED THE CUTTING EDGE THEREOF STRIKES AGAINST THE FACE OF THE FLAT STREAM OF DOPE EXTRUDED THROUGH THE SLOT, AND MEANS FOR CONTINUOUSLY AGITATING THE PRECIPITATING LIQUID.
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) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |