Patent US1012301A successfully refreshed from Google Patents.
Patent US3573233A successfully refreshed from Google Patents.
Patent FR495472A successfully refreshed from Google Patents.
Patent US745965A successfully refreshed from Google Patents.
Patent US4137560A successfully refreshed from Google Patents.
Patent US1788331A successfully refreshed from Google Patents.
US1788331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration process for flotable substances as ores, coals, graphite, and the like
Assignee: Individual
•
Filing: 1928-04-25
•
Granted: 1931-01-06
•
Expires: 1948-04-25
Abstract
No abstract record available.
Inventors
- 👤 Schafer Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:16
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/002; B03D2203/00; B03D2203/02; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1934-01-05 | 1934-07-07 | 1935-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-05 | 1938-07-07 | 1939-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-05 | 1942-07-07 | 1943-01-06 | $7700.00 | Window Closed / Lapsed |