US2991281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry aging
Assignee: Celanese Corp
•
Filing: 1954-01-13
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Granted: 1961-07-04
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Expires: 1974-01-13
Abstract
No abstract record available.
Inventors
- 👤 William H Bradshaw
- 👤 Robert R James
- 👤 Edward H Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:12
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/08; C08B1/10; Y; Y10; Y10S; Y10S162/00; Y10S162/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
PROCESS WHICH COMPRISES SUPPLYING TO ONE END OF A HORIZONTAL CYLINDRICAL VESSEL HAVING A SPIRAL VANE ROTATING ABOUT A HORIZONTAL AXIS A CONTINUOUS STREAM OF A LIQUID REACTION MIXTURE WHICH IS A STABLE DISPERSION OF SMALL BUBBLES OF AN OXYGEN-CONTAINING GAS IN A SLURRY OF ALKALI CELLULOSE IN AQUEOUS ALKALI CONTAINING AN EMULSIFYING AGENT, DIVIDING SAID CONTINUOUS STREAM INTO A PLURALITY OF SEPARATE SUCCESSIVE BATCHES IN SAID VESSEL AND MOVING SAID REACTION MIXTURE ALONG THE LENGTH OF SAID VESSEL BY THE ROTATION OF SAID VANE WHILE MAINTAINING SAID BATCHES SEPARATE BETWEEN CONVOLUTIONS OF SAID VANE WHILE SAID MIXTURE REACTS.
Claim 2
Dependent Claim
99 words
PROCESS WHICH COMPRISES SUPPLYING TO ONE END OF A HORIZONTAL CYLINDRICAL VESSEL HAVING A SPIRAL VANE ROTATING ABOUT A HORIZONTAL AXIS A CONTINUOUS STREAM OF A LIQUID REACTION MIXTURE WHICH IS A STABLE DISPERSION OF SMALL BUBBLES OF AN OXYGEN-CONTAINING GAS IN A SLURRY OF ALKALI CELLULOSE IN AQUEOUS ALKALI CONTAINING AN EMULSIFYING AGENT, DIVIDING SAID CONTINUOUS STREAM INTO A PLURALITY OF SEPARATE SUCCESSIVE BATCHES IN SAID VESSEL AND MOVING SAID REACTION MIXTURE ALONG THE LENGTH OF SAID VESSEL BY THE ROTATION OF SAID VANE WHILE MAINTAINING SAID BATCHES SEPARATE BETWEEN CONVOLUTIONS OF SAID VANE WHILE SAID MIXTURE REACTS.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |