US2933187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for flotation separation of lightweight aggregate and product
Assignee: SOUTHERN LIGHTWEIGHT AGGREGATE
•
Filing: 1956-08-21
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Granted: 1960-04-19
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Expires: 1976-08-21
Abstract
No abstract record available.
Inventors
- 👤 Old Albert Floyd
- 👤 Gibson Richard Francis
- 👤 Robert Von K Duey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/48; B03B5/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US650495A
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US654647A
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US992629A
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US2025841A
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US2199046A
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US2130144A
Cited
US2703289A
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US2713945A
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US2729570A
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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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |