US1655849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of coal
Assignee: Minerals Separation North American Corp
•
Filing: 1924-02-15
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Granted: 1928-01-10
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Expires: 1944-02-15
Abstract
No abstract record available.
Inventors
- 👤 Stenning William Warwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:55
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/1443; B03D1/1462; B03D1/24; B03D1/247
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) | 1931-01-09 | 1931-07-11 | 1932-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-09 | 1935-07-11 | 1936-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-09 | 1939-07-11 | 1940-01-10 | $7700.00 | Window Closed / Lapsed |