US3061408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of chemicals from waste liquors
Assignee: Arthur D Little Inc
•
Filing: 1960-05-05
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Granted: 1962-10-30
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Expires: 1980-05-05
Abstract
No abstract record available.
Inventors
- 👤 Robert J Lurie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:43
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0085; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
PROCESS FOR RECOVERING THE SODIUM AND SULFUR COMPONENTS FROM SODIUM-BASE SULFITE SPENT LIQUORS RESULTING FROM CHEMICAL DIGESTION OF A LIGNOCELLULOSE-CONTAINING MATERIAL, COMPRISING THE STEPS OF CONCENTRATING SAID SPENT LIQUORS, AND COMBUSTING THE RESULTING CONCENTRATED LIQUORS, SAID COMBUSTING STEP BEING CARRIED OUT IN THE PRESENCE OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF SILICA-RICH AND ALUMINA-RICH MATERIALS TO REACT SAID ADDITIVE WITH SAID SODIUM, AND SUBSEQUENTLY CONVERTING THE RESULTING SODIUM REACTION PRODUCTS TO SODIUM SULFITES IN THE PRESENCE OF AN ACIDIC REACTANT SELECTED FROM THE GROUP CONSISTING OF SO2, H2SO3 AND NAHSO, SAID ADDITIVE HAVING AS ITS ESSENTIAL REACTING COMPONENT WITH REPECT TO SAID SODIUM AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SIO2 AND AL2O3.
Claim 2
Dependent Claim
116 words
PROCESS FOR RECOVERING THE SODIUM AND SULFUR COMPONENTS FROM SODIUM-BASE SULFITE SPENT LIQUORS RESULTING FROM CHEMICAL DIGESTION OF A LIGNOCELLULOSE-CONTAINING MATERIAL, COMPRISING THE STEPS OF CONCENTRATING SAID SPENT LIQUORS, AND COMBUSTING THE RESULTING CONCENTRATED LIQUORS, SAID COMBUSTING STEP BEING CARRIED OUT IN THE PRESENCE OF AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF SILICA-RICH AND ALUMINA-RICH MATERIALS TO REACT SAID ADDITIVE WITH SAID SODIUM, AND SUBSEQUENTLY CONVERTING THE RESULTING SODIUM REACTION PRODUCTS TO SODIUM SULFITES IN THE PRESENCE OF AN ACIDIC REACTANT SELECTED FROM THE GROUP CONSISTING OF SO2, H2SO3 AND NAHSO, SAID ADDITIVE HAVING AS ITS ESSENTIAL REACTING COMPONENT WITH REPECT TO SAID SODIUM AN OXIDE SELECTED FROM THE GROUP CONSISTING OF SIO2 AND AL2O3.
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) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |