US2461978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical mine shaft shovel
Assignee: MILAN N BOSKOVICH
•
Filing: 1946-02-23
•
Granted: 1949-02-15
•
Expires: 1966-02-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur O Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:28
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US534510A
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US998029A
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US1596348A
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US1554131A
Cited
FR630975A
Cited
GB486168A
Cited
US2435669A
Cited
US2440501A
Cited
US2426591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |