US2428228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating valuable materials from grinding dusts and sludges
Assignee: METALS RECOVERY Co
•
Filing: 1942-07-15
•
Granted: 1947-09-30
•
Expires: 1962-07-15
Abstract
No abstract record available.
Inventors
- 👤 Walter E Keck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:20
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/06; B03B9/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-29 | 1951-03-31 | 1951-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-29 | 1955-03-31 | 1955-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-29 | 1959-03-31 | 1959-09-30 | $7700.00 | Window Closed / Lapsed |