Patent US3353671A successfully refreshed from Google Patents.
US3353671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation process with cyanoethyl alkylxanthate esters
Assignee: Wyeth Holdings LLC
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Filing: 1965-02-18
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Granted: 1967-11-21
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Expires: 1985-02-18
Abstract
No abstract record available.
Inventors
- 👤 Norbert M Bikales
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:40
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D2203/00; B03D2203/02; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
THE PROCESS OF BENEFICIATING METAL SULFIDE ORES WHICH COMPRISES GRINDING SAID ORES AND SUBJECTING THE GROUND ORE TO FROTH FLOTATION IN THE PRESENCE OF A COMPOUND OF THE FORMULA: R-O-C(=S)-S-CH2-CH2-CN WHEREIN R IS AN ALKYL RADICAL HAVING THREE TO EIGHT CARBON ATOMS, AND TO OBTAIN A RELATIVELY HIGH CONCENTRATION OF METAL SULFIDE IN THE FROTH.
Claim 2
Dependent Claim
55 words
THE PROCESS OF BENEFICIATING METAL SULFIDE ORES WHICH COMPRISES GRINDING SAID ORES AND SUBJECTING THE GROUND ORE TO FROTH FLOTATION IN THE PRESENCE OF A COMPOUND OF THE FORMULA: R-O-C(=S)-S-CH2-CH2-CN WHEREIN R IS AN ALKYL RADICAL HAVING THREE TO EIGHT CARBON ATOMS, AND TO OBTAIN A RELATIVELY HIGH CONCENTRATION OF METAL SULFIDE IN THE FROTH.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |