US3028215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of sodium carbonate
Assignee: FMC Corp
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Filing: 1959-12-02
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Granted: 1962-04-03
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Expires: 1979-12-02
Abstract
No abstract record available.
Inventors
- 👤 Frint William Ramon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:47
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/40; C01B25/41; C01B25/412; C01D; C01D7/00; C01D7/22; C01D7/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE METHOD OF PRODUCING SODIUM CARBONATE FROM NATURALLY OCCURING CRUDE TRONA CONTAINING ORGANIC IMPURITIES WHICH COMPRISES DISSOLVING SAID CRUDE TRONA IN A LIQUID FROM WHICH THE DISSOLVED TRONA MAY BE CRYSTALLIZED, CLARIFYING SAID SOLUTION, WHILE LEAVING ORGANIC IMPURITIES DISSOLVED THEREIN, CRYSTALLIZING AND RECOVERING SODIUM CARBONATE-CONTAINING CRYSTALS FROM SAID SOLUTION, SAID CRYSTALS CONTAINING ORGANIC IMPURITIES, CALCINING SAID
Claim 2
Independent Claim
56 words
THE METHOD OF PRODUCING SODIUM CARBONATE FROM NATURALLY OCCURING CRUDE TRONA CONTAINING ORGANIC IMPURITIES WHICH COMPRISES DISSOLVING SAID CRUDE TRONA IN A LIQUID FROM WHICH THE DISSOLVED TRONA MAY BE CRYSTALLIZED, CLARIFYING SAID SOLUTION, WHILE LEAVING ORGANIC IMPURITIES DISSOLVED THEREIN, CRYSTALLIZING AND RECOVERING SODIUM CARBONATE-CONTAINING CRYSTALS FROM SAID SOLUTION, SAID CRYSTALS CONTAINING ORGANIC IMPURITIES, CALCINING SAID
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |