US2530714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mucking machine for inclined mine shafts
Assignee: Individual
•
Filing: 1949-03-21
•
Granted: 1950-11-21
•
Expires: 1969-03-21
Abstract
No abstract record available.
Inventors
- 👤 Stanley W Mcdougall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US978540A
Cited
US1300111A
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US2348796A
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US2346471A
Cited
US2489898A
Cited
US2409752A
Cited
US2441582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |