US1652099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of concentrating ores and minerals by flotation
Assignee: EIDP Inc
•
Filing: 1926-10-25
•
Granted: 1927-12-06
•
Expires: 1946-10-25
Abstract
No abstract record available.
Inventors
- 👤 William A Douglass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:28
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 0
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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) | 1930-12-05 | 1931-06-06 | 1931-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-12-05 | 1935-06-06 | 1935-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-12-05 | 1939-06-06 | 1939-12-06 | $7700.00 | Window Closed / Lapsed |