US168695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in separating gold from other metals
Assignee: —
•
Filing: —
•
Granted: 1875-10-11
•
Expires: 1892-10-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:59
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/10; C22B3/00; C22B3/20; C22B3/22; C22B3/04; C22B3/06; C22B3/08; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1878-10-10 | 1879-04-11 | 1879-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1882-10-10 | 1883-04-11 | 1883-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1886-10-10 | 1887-04-11 | 1887-10-11 | $7700.00 | Window Closed / Lapsed |