US1904460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of ores by flotation
Assignee: Barrett Co Inc
•
Filing: 1927-02-15
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Granted: 1933-04-18
•
Expires: 1947-02-15
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Moses
- 👤 Raymond W Hess
- 👤 Robert L Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:19
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D2201/00; B03D2201/02; 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) | 1936-04-17 | 1936-10-17 | 1937-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-17 | 1940-10-17 | 1941-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-17 | 1944-10-17 | 1945-04-18 | $7700.00 | Window Closed / Lapsed |