US3764650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of gold from ores
Assignee: United States Department of the Interior
•
Filing: 1970-12-31
•
Granted: 1973-10-09
•
Expires: 1990-12-31
Abstract
Abstract Gold is recovered from ores by slurrying the ores with an acidsalt mixture and treating the slurry with ozone, whereby the gold is extracted in the form of a chloride complex.
Inventors
- 👤 B Scheiner
- 👤 R Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/06; C01; C01G; C01G7/00; C22B11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
The method of claim 1 in which the chloride salt is sodium chloride.
Claim 2
Dependent Claim
13 words
The method of claim 1 in which the mineral acid is sulfuric acid.
References Cited (Backward Citations)
US732641A
Cited
US738758A
Cited
GB190525672A
Cited
US971252A
Cited
US984090A
Cited
US3545964A
Cited
US3574600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |