US3819805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of soda ash from trona ore
Assignee: Henley Group Inc
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Filing: 1971-04-14
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Granted: 1974-06-25
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Expires: 1991-04-14
Abstract
Abstract A PROCESS FOR BENEFICIATING TRONA ORE FOR PRODUCING SODA ASH, WHICH COMPRISES CRUSHING THE ORE, SEPARATING THE ORE BY OPTICAL-MECHANICAL SORTING MEANS, RECOVERING THE DESIRED TRONA ORE FRACTION AND CONVERTING SAID BENEFICIATED FRACTION TO SODA ASH BY CIRCULATION.
Inventors
- 👤 C Graves
- 👤 P Sopchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/35; C01D7/37; B; B03; B03B; B03B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |