US2211686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depression of gangue during flotation
Assignee: Wyeth Holdings LLC
•
Filing: 1938-06-28
•
Granted: 1940-08-13
•
Expires: 1958-06-28
Abstract
No abstract record available.
Inventors
- 👤 Robert B Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02; B03D2203/025; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-08-13 | 1944-02-12 | 1944-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-13 | 1948-02-12 | 1948-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-13 | 1952-02-12 | 1952-08-13 | $7700.00 | Window Closed / Lapsed |