US2985419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof supports for mine workings
Assignee: Mining Engineering Co Ltd MECO
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Filing: 1958-06-09
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Granted: 1961-05-23
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Expires: 1978-06-09
Abstract
No abstract record available.
Inventors
- 👤 Duncan Angus Wellesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:35
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/14; E21D15/44; E21D15/58; E21D15/585; E21D15/586; E21D15/587
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |