US2829045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of extracting precious metals from their ores by the use of alphahydroxynitriles
Assignee: Wyeth Holdings LLC
•
Filing: 1957-01-22
•
Granted: 1958-04-01
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Erwin L Carpenter
- 👤 Hedley Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:26
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
IN A PROCESS OF EXTRACTING CYANIDABLE PRECIOUS METALS FROM ORES CONTAINING THE SAME IN WHICH THE ORE IS GROUND AND FORMED INTO AN AQUEOUS PULP, THE IMPROVEMENT WHICH COMPRISES SUBJECTING SAID AQUEOUS PULP TO EXTRACTION IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF AN ALPHA-HYDROXY NITRILE AND RECOVERING THE PRECIOUS METAL SO EXTRACTED.
Claim 2
Dependent Claim
53 words
IN A PROCESS OF EXTRACTING CYANIDABLE PRECIOUS METALS FROM ORES CONTAINING THE SAME IN WHICH THE ORE IS GROUND AND FORMED INTO AN AQUEOUS PULP, THE IMPROVEMENT WHICH COMPRISES SUBJECTING SAID AQUEOUS PULP TO EXTRACTION IN THE PRESENCE OF AN EFFECTIVE AMOUNT OF AN ALPHA-HYDROXY NITRILE AND RECOVERING THE PRECIOUS METAL SO EXTRACTED.
References Cited (Backward Citations)
US2293066A
Cited
US2729557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |