Patent US4253481A successfully refreshed from Google Patents.
Patent US2656245A successfully refreshed from Google Patents.
US2656245A
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Preparation of sodium salts of carbonic acid by ion exchange
Assignee: Rayonier Inc
•
Filing: 1950-07-15
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Granted: 1953-10-20
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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
2026-10-29 09:20
CPC Classifications
C; C01; C01D; C01D7/00; D; D21; D21C; D21C11/00; D21C11/0042; D21C11/005; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A PROCESS FOR THE PREPARATION OF SODIUM SALTS, THE IMPROVEMENT WHICH COMPRISES BRINGING AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE SODIUM SALT OF A WEAKLY ACIDIC VOLATILE ACID OF THE GROUP CONSISTING OF SODIUM SULFIDE AND SODIUM CARBONATE INTO REACTING CONTACT WITH A CATION EXCHANGE RESIN HAVING ACTIVE EXCHANGE CENTERS WHICH ARE WEAKLY ACIDIC GROUPS IN HYDROGEN FORM, EVOLVING A SUBSTANTIAL PORTION OF THE VOLATILE ACID IN GASEOUS FORM AND ABSORBING SODIUM ON THE RESIN, AND CONTACTING THE RESIN CONTAINING ABSORBED SODIUM WITH CARBONIC ACID IN SOLUTION UNDER A CARBON DIOXIDE PRESSURE OF FROM 2 TO 50 ATMOSPHERES TO FORM A SODIUM SALT OF CARBONIC ACID AND REGENERATE THE RESIN.
Claim 2
Dependent Claim
111 words
IN A PROCESS FOR THE PREPARATION OF SODIUM SALTS, THE IMPROVEMENT WHICH COMPRISES BRINGING AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE SODIUM SALT OF A WEAKLY ACIDIC VOLATILE ACID OF THE GROUP CONSISTING OF SODIUM SULFIDE AND SODIUM CARBONATE INTO REACTING CONTACT WITH A CATION EXCHANGE RESIN HAVING ACTIVE EXCHANGE CENTERS WHICH ARE WEAKLY ACIDIC GROUPS IN HYDROGEN FORM, EVOLVING A SUBSTANTIAL PORTION OF THE VOLATILE ACID IN GASEOUS FORM AND ABSORBING SODIUM ON THE RESIN, AND CONTACTING THE RESIN CONTAINING ABSORBED SODIUM WITH CARBONIC ACID IN SOLUTION UNDER A CARBON DIOXIDE PRESSURE OF FROM 2 TO 50 ATMOSPHERES TO FORM A SODIUM SALT OF CARBONIC ACID AND REGENERATE THE RESIN.
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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) | 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 |