Patent US3838189A successfully refreshed from Google Patents.
US3838189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage process for producing soda ash from trona
Assignee: Henley Group Inc
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Filing: 1972-09-13
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Granted: 1974-09-24
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Expires: 1992-09-13
Abstract
Abstract OF SHORT DURATION TO ELIMINATE CONTAINED ORGANIC MATETER WHILE MINIMIZING SOLUBLIZATION OF CONTAINED SILICA. TWO STEP CALCINATION PROCESS FOR PREPARING SODIUM CARBIMATE FROM TRONA, COMPRISING ALOW TEMPERATURE CALCINATION TO CONVERT THE CONTAINED SESQUICARBONATE TO SODUIM CARBONATE, FOLLOWED BY A HIGH TEMPERATURE ROASTING STEP
Inventors
- 👤 P Sopchak
- 👤 J Guptill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:13
CPC Classifications
C; C01; C01D; C01D7/00
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |