Patent US4342841A successfully refreshed from Google Patents.
Patent US2620068A successfully refreshed from Google Patents.
US2620068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depression of copper minerals from ores and concentrates
Assignee: Wyeth Holdings LLC
•
Filing: 1951-08-16
•
Granted: 1952-12-02
•
Expires: 1971-08-16
Abstract
No abstract record available.
Inventors
- 👤 Allen Charles Francis
- 👤 Booth Robert Ben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:21
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/002; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS OF SELECTIVELY DEPRESSING COPPER SULFIDES IN THE PRESENCE OF A SULFIDE INCLUDED IN THE GROUP CONSISTING OF LEAD SULFIDES AND MOLYBDENUM SULFIDES WHICH COMPRISES EFFECTING FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR FOR SULFIDES AND FROM 2 TO 15 LBS./TON OF A DEPRESSANT CONTAINING THE CYANIDE RADICAL, A CATION SELECTED FROM THE GROUP CONSISTING OF ZINC MAGNESIUM AND ALUMINIUM, AND NON-IONICALY LINKED AMMONIA.
Claim 2
Dependent Claim
66 words
A PROCESS OF SELECTIVELY DEPRESSING COPPER SULFIDES IN THE PRESENCE OF A SULFIDE INCLUDED IN THE GROUP CONSISTING OF LEAD SULFIDES AND MOLYBDENUM SULFIDES WHICH COMPRISES EFFECTING FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR FOR SULFIDES AND FROM 2 TO 15 LBS./TON OF A DEPRESSANT CONTAINING THE CYANIDE RADICAL, A CATION SELECTED FROM THE GROUP CONSISTING OF ZINC MAGNESIUM AND ALUMINIUM, AND NON-IONICALY LINKED AMMONIA.
References Cited (Backward Citations)
US1429544A
Cited
US1552936A
Cited
US1596120A
Cited
US1609038A
Cited
US1735190A
Cited
US1939068A
Cited
US1974218A
Cited
US2105901A
Cited
GB607731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |