Patent US2729557A successfully refreshed from Google Patents.
US2729557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing deposition of alkaline earth metal salts in cyanidation of precious metal ores
Assignee: Wyeth Holdings LLC
•
Filing: 1955-02-02
•
Granted: 1956-01-03
•
Expires: 1975-02-02
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
- 👤 Hedley Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:30
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF PREVENTING THE DEPOSITION OF ALKALINE EARTH METAL SALTS FROM CYANIDE SOLUTIONS WHICH COMPRISES INCORPORATION IN THE SOLUTION A SMALL AMOUNT OF A SYNTHETIC POLYMERIC WATER-SOLUBLE POLYELECTROLYTE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 10,000, AND HAVING A STRUCTURE DERIVED BY THE SUBSTANTIALLY LINERA POLYMERIZATION OF AT LEAST ONE MONOOLEFINIC COMPOUND THROUGH THE ALIPHATIC UNSATURATED GROUP.
Claim 2
Independent Claim
59 words
THE METHOD OF PREVENTING THE DEPOSITION OF ALKALINE EARTH METAL SALTS FROM CYANIDE SOLUTIONS WHICH COMPRISES INCORPORATION IN THE SOLUTION A SMALL AMOUNT OF A SYNTHETIC POLYMERIC WATER-SOLUBLE POLYELECTROLYTE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 10,000, AND HAVING A STRUCTURE DERIVED BY THE SUBSTANTIALLY LINERA POLYMERIZATION OF AT LEAST ONE MONOOLEFINIC COMPOUND THROUGH THE ALIPHATIC UNSATURATED GROUP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |