US2711634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof supporting means
Assignee: Joy Manufacturing Co
•
Filing: 1949-05-25
•
Granted: 1955-06-28
•
Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Joy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:47
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/006; E21D23/0073; E21D19/00; E21D19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US778168A
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US2313242A
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US2320653A
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CH255190A
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US2496694A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-27 | 1958-12-27 | 1959-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-27 | 1962-12-27 | 1963-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-27 | 1966-12-27 | 1967-06-28 | $7700.00 | Window Closed / Lapsed |