US1684870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal concentrating and amalgamating apparatus of the vertical type
Assignee: Individual
•
Filing: 1927-10-17
•
Granted: 1928-09-18
•
Expires: 1947-10-17
Abstract
No abstract record available.
Inventors
- 👤 Frank D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:17
CPC Classifications
C; C22; C22B; C22B11/00; C22B11/10; Y; Y10; Y10S; Y10S494/00; Y10S494/902
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) | 1931-09-18 | 1932-03-19 | 1932-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-09-18 | 1936-03-19 | 1936-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-09-18 | 1940-03-19 | 1940-09-18 | $7700.00 | Window Closed / Lapsed |