US2421379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft mucking machine
Assignee: Individual
•
Filing: 1944-12-06
•
Granted: 1947-06-03
•
Expires: 1964-12-06
Abstract
No abstract record available.
Inventors
- 👤 John W Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:10
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE177524C
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DE156395C
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US489634A
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US553082A
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US1048244A
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US1440400A
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DE486168C
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US1902457A
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US2358543A
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US2326172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |