US2174540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of ore treatment
Assignee: Mining Process and Patent Co
•
Filing: 1935-07-22
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Granted: 1939-10-03
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Expires: 1955-07-22
Abstract
No abstract record available.
Inventors
- 👤 Harry V Wallace
- 👤 Leland H Logue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B01; B01D; B01D21/00; B01D21/26; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2323; B01F23/23231; B01F23/232311; B01F23/233; B01F23/2331; B01F23/237; B01F23/2376; B01F23/23761; B01F23/237612; B01F23/40; B01F23/45; B01F23/454; B01F35/00; B01F35/30; B01F35/32; B01F35/32005; B01F35/3203; B01F35/71; B01F35/712; B01F35/717; B01F35/7179; B01F35/75; B01F35/754; B01F35/7542; B03D1/08; B03D1/082; B03D1/1443; B03D1/1462; B03D1/1493; B01F21/00; B01F27/00; B01F27/05; B01F27/11; B01F27/113; B03D1/1412
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) | 1942-10-02 | 1943-04-03 | 1943-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-02 | 1947-04-03 | 1947-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-02 | 1951-04-03 | 1951-10-03 | $7700.00 | Window Closed / Lapsed |