Patent US2808931A successfully refreshed from Google Patents.
US2808931A
Expired / Lapsed
US
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Allyl esters of alkyl xanthates
Assignee: Wyeth Holdings LLC
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Filing: 1951-05-01
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Granted: 1957-10-08
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Expires: 1971-05-01
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
- 👤 David E Ailman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:57
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; A; A01; A01N; A01N57/00; A01N57/10; A01N57/12; B03D1/014; C; C07; C07C; C07C329/00; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/025; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS OF FROTH FLOTATION WHICH COMPRISES SUBJECTING AN ORE PULP SELECTED FROM THE GROUP CONSISTING OF SULFIDE AND PERCIOUS METAL ORES TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR OF THE FORMULA
Claim 2
Dependent Claim
34 words
A PROCESS OF FROTH FLOTATION WHICH COMPRISES SUBJECTING AN ORE PULP SELECTED FROM THE GROUP CONSISTING OF SULFIDE AND PERCIOUS METAL ORES TO FROTH FLOTATION IN THE PRESENCE OF A COLLECTOR OF THE FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |