Patent US2073148A successfully refreshed from Google Patents.
US2073148A
Expired / Lapsed
US
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Flotation of minerals
Assignee: General Engineering Co Ltd
•
Filing: 1934-06-14
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Granted: 1937-03-09
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Expires: 1954-06-14
Abstract
No abstract record available.
Inventors
- 👤 Gayford Ernest
- 👤 Heginbotham Joseph Howard
- 👤 Philip D P Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:51
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/1406; B03D1/1412; B03D1/1487; B03D1/24; B03D1/245
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) | 1940-03-08 | 1940-09-07 | 1941-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-08 | 1944-09-07 | 1945-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-08 | 1948-09-07 | 1949-03-09 | $7700.00 | Window Closed / Lapsed |