US2808152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terminal construction for electrically heated screens of material separators
Assignee: MARBLE CLIFF QUARRIES Co
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Filing: 1956-01-04
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Granted: 1957-10-01
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Expires: 1976-01-04
Abstract
No abstract record available.
Inventors
- 👤 John S Kaufman
- 👤 Charles F Lepley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:42
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/56; B07B1/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB247791A
Cited
US1710795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |