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US1231707A
Expired / Lapsed
US
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Apparatus for treating ores and the like.
Assignee: HOLT-CHRISTENSEN PROCESS Co
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Filing: 1915-03-30
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Granted: 1917-07-03
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Expires: 1935-03-30
Abstract
No abstract record available.
Inventors
- 👤 Niels C Christensen Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:56
CPC Classifications
B; B01; B01F; B01F21/00; B01F21/20; B01D; B01D11/00; B01D2011/002
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) | 1920-07-02 | 1921-01-01 | 1921-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-07-02 | 1925-01-01 | 1925-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-07-02 | 1929-01-01 | 1929-07-03 | $7700.00 | Window Closed / Lapsed |