US3322659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating of electrolytic aluminum reduction cell gases to recover fluorine values
Assignee: Individual
•
Filing: 1964-06-17
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Granted: 1967-05-30
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Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 Paquet Jean Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:23
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/16; C01C1/162; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; C25; C25C; C25C3/00; C25C3/06; C25C3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS OF TREATING WASTE-GAS FROM AN ELECTROLYTIC ALUMINUM REDUCTION CELL HAVING A FUSED CRYOLITE-ALUMINA BATH WHICH PROCESS COMPRISES: TREATING SAID WASTE-GAS STREAM WITH AMMONIA GAS AT A TEMPERATURE SUCH THAT A SOLID AMMONIA REACTION PRODUCT IS FORMED; AND FILTERING SAID TREATED GAS STREAM TO REMOVE SAID SOLID REACTION PRODUCT.
Claim 2
Dependent Claim
50 words
A PROCESS OF TREATING WASTE-GAS FROM AN ELECTROLYTIC ALUMINUM REDUCTION CELL HAVING A FUSED CRYOLITE-ALUMINA BATH WHICH PROCESS COMPRISES: TREATING SAID WASTE-GAS STREAM WITH AMMONIA GAS AT A TEMPERATURE SUCH THAT A SOLID AMMONIA REACTION PRODUCT IS FORMED; AND FILTERING SAID TREATED GAS STREAM TO REMOVE SAID SOLID REACTION PRODUCT.
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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |