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US2606679A
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Apparatus for use in shaft sinking
Assignee: Shaft Machines Ltd
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Filing: 1949-09-13
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Granted: 1952-08-12
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Expires: 1969-09-13
Abstract
No abstract record available.
Inventors
- 👤 Warner L Cryderman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:31
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/03; E21D1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US796842A
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US2491583A
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US2538711A
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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) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |