US3574600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of gold from carbonaceous ores
Assignee: United States Department of the Interior
•
Filing: 1968-05-15
•
Granted: 1971-04-13
•
Expires: 1988-05-15
Abstract
Abstract CARBONACEOUS GOLD ORES ARE RENDERED AMENABLE TO A CONVENTIONAL CYANIDE RECOVERY PROCESS BY PRETREATMENT WITH ACID-OZONE MIXTURE, OR ALKALINE SODIUM HYPOCHLORITE OR ALKALINE CALCIUM HYPOCHLORITE COMPOUNDS AT TEMPERATURES UNDER 70*C. HYPOCHLORITE SOLUTIONS CAN BE GENERATED IN SITU BY ELECTROLYSIS OF CHLORIDE SOLUTIONS.
Inventors
- 👤 Bernard J Scheiner
- 👤 Roald E Lindstrom
- 👤 Thomas A Henrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |