US3133789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical recovery of waste liquors
Assignee: Lummus Technology LLC
•
Filing: 1961-05-10
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Granted: 1964-05-19
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Expires: 1981-05-10
Abstract
No abstract record available.
Inventors
- 👤 Salvatore A Guerrieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:43
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/02; D; D21; D21C; D21C11/00; D21C11/12; D21C11/122; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A PROCESS FOR TREATING SODIUJM BASE WASTE LIQUORS OBTAINED FROM A WOOD PULPING PROCESS, THE STEPS OF BURNING SAID WASTE LIQUORS TO FORM A SMELT CONTAINING SODIUM SULFIDE, CONTACTING THE RESULTING SMELT WITH CARBON DIOXIDE AND STEAM TO CONVERT SODIUM SULFIDE TO SODIUM CARBONATE, AND MAINTAINING THE TEMPERATURE OF SAID CONVERSION ABOVE 851*C.
Claim 2
Dependent Claim
54 words
IN A PROCESS FOR TREATING SODIUJM BASE WASTE LIQUORS OBTAINED FROM A WOOD PULPING PROCESS, THE STEPS OF BURNING SAID WASTE LIQUORS TO FORM A SMELT CONTAINING SODIUM SULFIDE, CONTACTING THE RESULTING SMELT WITH CARBON DIOXIDE AND STEAM TO CONVERT SODIUM SULFIDE TO SODIUM CARBONATE, AND MAINTAINING THE TEMPERATURE OF SAID CONVERSION ABOVE 851*C.
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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |