US3689218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of active magnesia
Assignee: Velsicol Chemical LLC
•
Filing: 1970-07-24
•
Granted: 1972-09-05
•
Expires: 1990-07-24
Abstract
Abstract A PROCESS IS DISCLOSED FOR TREATING INLAND BRINES OR OTHER SUITABLE SOURCES OF MAGNESISA WITH AN ALKALI METAL HYDROXIDE, SUCH AS SODIUM HYDROXIDE, PRIOR TO CLACINING FOR INCREASING THE IODINE NUMBER; THAT IS, INCREASING THE SURFACE AREA AND THEREFORE THE ACTIVITY; AND FOR PROVIDING A MORE UNIFORM IODINE NUMBER FROM BATCH TO BATCH.
Inventors
- 👤 James Kelly Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:43
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/14; C01F5/22; C01F5/02; C01F5/06; C01F5/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |