US2812169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine-cooling system
Assignee: Union Carbide Corp
•
Filing: 1954-05-26
•
Granted: 1957-11-05
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Expires: 1974-05-26
Abstract
No abstract record available.
Inventors
- 👤 George T Felbeck
- 👤 John T Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:26
CPC Classifications
E; E21; E21C; E21C35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1592078A
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US2283118A
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US2437492A
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US2557649A
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US2694562A
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US2662742A
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GB672403A
Cited
US2641064A
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US2743095A
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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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |