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US2479408A
Expired / Lapsed
US
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Mine ventilation
Assignee: Individual
•
Filing: 1944-03-18
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Granted: 1949-08-16
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Expires: 1964-03-18
Abstract
No abstract record available.
Inventors
- 👤 Allan S Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
E; E21; E21F; E21F3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2017027A
Cited
US1909823A
Cited
US1878542A
Cited
US2062711A
Cited
US2235004A
Cited
US2192126A
Cited
US2280633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |