US2656244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering chemicals from smelts obtained in pulping operation
Assignee: Rayonier Inc
•
Filing: 1950-07-15
•
Granted: 1953-10-20
•
Expires: 1970-07-15
Abstract
No abstract record available.
Inventors
- 👤 Gray Kenneth Russell
- 👤 Crosby Hartzell Lance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:12
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0042; D21C11/005; C; C01; C01B; C01B17/00; C01B17/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN THE PREPARATION OF WOOD PULP, THE PROCESS FOR RECOVERING CHEMICALS WHICH COMPRISES COMBUSTING WASTE LIQUOR FROM THE ALKALINE TREATMENT OF SULFITE DIGESTED PULP TO YIELD A SMELT CONTAINING A SODIUM SALT OF A WEAKLY ACIDIC VOLATILE ACID OF THE GROUP CONSISTING OF HYDROGEN SULFIDE AND CARBONIC ACID, TREATING A SOLUTION OF SAID SMELT WITH A CATION EXCHANGE RESIN HAVING ACTIVE EXCHANGE CENTERS IN HYDROGEN FORM WHICH ARE SUBSANTIALLY LESS ACIDIC THAN SULFUR DIOXIDE AND EVOLVING A SUBSTANTIAL PORTION OF SAID VOLATILE
Claim 2
Dependent Claim
82 words
IN THE PREPARATION OF WOOD PULP, THE PROCESS FOR RECOVERING CHEMICALS WHICH COMPRISES COMBUSTING WASTE LIQUOR FROM THE ALKALINE TREATMENT OF SULFITE DIGESTED PULP TO YIELD A SMELT CONTAINING A SODIUM SALT OF A WEAKLY ACIDIC VOLATILE ACID OF THE GROUP CONSISTING OF HYDROGEN SULFIDE AND CARBONIC ACID, TREATING A SOLUTION OF SAID SMELT WITH A CATION EXCHANGE RESIN HAVING ACTIVE EXCHANGE CENTERS IN HYDROGEN FORM WHICH ARE SUBSANTIALLY LESS ACIDIC THAN SULFUR DIOXIDE AND EVOLVING A SUBSTANTIAL PORTION OF SAID VOLATILE
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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |