Patent US2554138A successfully refreshed from Google Patents.
US2554138A
Expired / Lapsed
US
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Concentrating apparatus
Assignee: Mojonnier Bros Co
•
Filing: 1944-09-14
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Granted: 1951-05-22
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Expires: 1964-09-14
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:08
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/06; Y; Y10; Y10S; Y10S159/00; Y10S159/35
Claims Analysis
Total Claims: 0
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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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |