US2695101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frothing agents for the flotation of ores and coal
Assignee: Wyeth Holdings LLC
•
Filing: 1952-12-10
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Granted: 1954-11-23
•
Expires: 1972-12-10
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
- 👤 John M Dobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/0043; B03D1/012; B03D2201/00; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE METHOD OF CONCENTRATING ORES WHICH COMPRISES SUBJECTING AN EQUEOUS PULP OF SAID ORE TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR AND IN THE PRESENCE AS A FROTHER OF A POLYPROPYLENE GLYCOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF 140 TO 2100.
Claim 2
Independent Claim
45 words
THE METHOD OF CONCENTRATING ORES WHICH COMPRISES SUBJECTING AN EQUEOUS PULP OF SAID ORE TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR AND IN THE PRESENCE AS A FROTHER OF A POLYPROPYLENE GLYCOL HAVING A MOLECULAR WEIGHT IN THE RANGE OF 140 TO 2100.
References Cited (Backward Citations)
US1370366A
Cited
US1970578A
Cited
US1995915A
Cited
US2467369A
Cited
GB674258A
Cited
US2611485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |