US2745650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contractible boring head for mining machines
Assignee: Goodman Manufacturing Co LP
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Filing: 1954-12-16
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Granted: 1956-05-15
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Expires: 1974-12-16
Abstract
No abstract record available.
Inventors
- 👤 Herman E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US756590A
Cited
US1710998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |