Patent US3498744A successfully refreshed from Google Patents.
US3498744A
Expired / Lapsed
US
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Purification of calcined crude trona by monohydrate recrystallization
Assignee: Intermountain Research and Development Corp
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Filing: 1961-09-18
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Granted: 1970-03-03
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Expires: 1981-09-18
Abstract
No abstract record available.
Inventors
- 👤 William R Frint
- 👤 Richard W Waggener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:34
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/22; C01D7/28; C01D7/12; C01D7/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS OF TREATING PARTICULATE CRUDE TRONA CONTAINING SODIUM SESQUICARBONATE AND INSOLUBLE IMPURITIES TO SEPARATE ON THE BASIS OF DIFFERING PARTICLE SIZE SOLID PARTICLES OF HYDRATED SODIUM CARBONATE FROM THE INSOLUBLE IMPURITIES, WHICH COMPRISES CALCINING SAID CRUDE TRONA TO FORM ANHYDROUS SODIUM CARBONATE, CONVERTING SAID ANHYDROUS SODIUM CARBONATE INTO HYDRATED SODIUM CARBONATE CRYSTALS OF SIZE GREATER THAN THE PARTICLE SIZE OF SAID INSOLUBLE IMPURITIES BY INTRODUCING THE CALCINED TRONA INTO A SAURATED AQUEOUS SOLUTIONOF SODIUM CARBONATE, AND SEPARATING SAID HYDRATED SODIUM CARBONATE IN CRYSTALLINE FORM FROM SAID SATURATED SOLUTION AND FROM SAID INSOLUBLE IMPURITIES ON THE BASIS OF THEIR DIFFERING PARTICLE SIZE.
Claim 2
Dependent Claim
102 words
THE PROCESS OF TREATING PARTICULATE CRUDE TRONA CONTAINING SODIUM SESQUICARBONATE AND INSOLUBLE IMPURITIES TO SEPARATE ON THE BASIS OF DIFFERING PARTICLE SIZE SOLID PARTICLES OF HYDRATED SODIUM CARBONATE FROM THE INSOLUBLE IMPURITIES, WHICH COMPRISES CALCINING SAID CRUDE TRONA TO FORM ANHYDROUS SODIUM CARBONATE, CONVERTING SAID ANHYDROUS SODIUM CARBONATE INTO HYDRATED SODIUM CARBONATE CRYSTALS OF SIZE GREATER THAN THE PARTICLE SIZE OF SAID INSOLUBLE IMPURITIES BY INTRODUCING THE CALCINED TRONA INTO A SAURATED AQUEOUS SOLUTIONOF SODIUM CARBONATE, AND SEPARATING SAID HYDRATED SODIUM CARBONATE IN CRYSTALLINE FORM FROM SAID SATURATED SOLUTION AND FROM SAID INSOLUBLE IMPURITIES ON THE BASIS OF THEIR DIFFERING PARTICLE SIZE.
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) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |