Patent US2838489A successfully refreshed from Google Patents.
US2838489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hardening cellulose acetate and apparatus suitable therefor
Assignee: Celanese Corp
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Filing: 1954-09-15
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Granted: 1958-06-10
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Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 John G Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:56
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
IN A TREATING APPARATUS, A VESSEL HAVING AN INLET AND AN OUTLET AT OPPOSITE ENDS THEREOF,S MEANS FOR SUPPLYING A CONTINUOUS STREAM OF A FLOWABLE MATERIAL TO THE INLET OF SAID VESSEL, AND MEANS FOR DIVIDING SAID CONTINUOUS STREAM INTO SUCCESSIVE SEPARATE BATCHES AND FOR MOVING SAID BATCHES IN SEPARATED CONDITION ALONG THE LENGTH OF SAID VESSEL FROM SAID INLET TO SAID OUTLET, SAID MEANS INCLUDING A ROTATABLE SPIRAL VANE MOUNTED IN SAID VESSEL, SAID VANE HAVING A PLURALITY OF CONVOLUTIONS FOR MAINTAINING SAID BATCHES SEPARATE AND FOR MOVING SAID BATCHES ALONG THE LENGTH OF SAID VESSEL AS SAID VANES ROTATES, AND A SECOND SPIRAL VANE PITCHED IN THE SAME DIRECTION AS SAID FIRST VANE AND INTERLACED THEREWITH, SAID SECOND VANE EXTENDING FROM THE OUTLET END OF SAID VESSEL TO A POINT ADJACENT TO SAID OUTLET END.
Claim 2
Dependent Claim
137 words
IN A TREATING APPARATUS, A VESSEL HAVING AN INLET AND AN OUTLET AT OPPOSITE ENDS THEREOF,S MEANS FOR SUPPLYING A CONTINUOUS STREAM OF A FLOWABLE MATERIAL TO THE INLET OF SAID VESSEL, AND MEANS FOR DIVIDING SAID CONTINUOUS STREAM INTO SUCCESSIVE SEPARATE BATCHES AND FOR MOVING SAID BATCHES IN SEPARATED CONDITION ALONG THE LENGTH OF SAID VESSEL FROM SAID INLET TO SAID OUTLET, SAID MEANS INCLUDING A ROTATABLE SPIRAL VANE MOUNTED IN SAID VESSEL, SAID VANE HAVING A PLURALITY OF CONVOLUTIONS FOR MAINTAINING SAID BATCHES SEPARATE AND FOR MOVING SAID BATCHES ALONG THE LENGTH OF SAID VESSEL AS SAID VANES ROTATES, AND A SECOND SPIRAL VANE PITCHED IN THE SAME DIRECTION AS SAID FIRST VANE AND INTERLACED THEREWITH, SAID SECOND VANE EXTENDING FROM THE OUTLET END OF SAID VESSEL TO A POINT ADJACENT TO SAID OUTLET END.
Claim 3
Dependent Claim
63 words
PROCESS FOR HARDENING CELLULOSE ACETATE DIRECTLY AFTER CONTINUOUSLY PRECIPITATING THE SAME FROM A SOLUTION THEREOF WHICH COMPRISES SUPPLYING A CONTINUOUS STREAM OF A MIXTURE OF PRECIPITATED CELLULOSE ACETATE AND PRECIPITATING MEDIUM THEREFOR, CONTINUOUSLY DIVIDING SAID STREAM INTO SUCCESSIVE SEPARATE BATCHES, AND PASSING SAID BATCHES CONTINUOUSLY AND SUCCESSIVELY THROUGH A HARDENING ZONE WHILE MAINTAINING EACH OF SAID BATCHES SUBSTANTIALLY SEPARATE FROM THE SUCCEEDING BATCH.
Claim 4
Dependent Claim
63 words
PROCESS FOR HARDENING CELLULOSE ACETATE DIRECTLY AFTER CONTINUOUSLY PRECIPITATING THE SAME FROM A SOLUTION THEREOF WHICH COMPRISES SUPPLYING A CONTINUOUS STREAM OF A MIXTURE OF PRECIPITATED CELLULOSE ACETATE AND PRECIPITATING MEDIUM THEREFOR, CONTINUOUSLY DIVIDING SAID STREAM INTO SUCCESSIVE SEPARATE BATCHES, AND PASSING SAID BATCHES CONTINUOUSLY AND SUCCESSIVELY THROUGH A HARDENING ZONE WHILE MAINTAINING EACH OF SAID BATCHES SUBSTANTIALLY SEPARATE FROM THE SUCCEEDING BATCH.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |