Patent US2717674A successfully refreshed from Google Patents.
US2717674A
Expired / Lapsed
US
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Coal mining drill apparatus
Assignee: Individual
•
Filing: 1952-04-04
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Granted: 1955-09-13
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Expires: 1972-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Andrew B Crichton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:18
CPC Classifications
E; E21; E21C; E21C37/00; E21C37/22; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7075; Y10T403/7077; Y10T403/7079; Y10T403/7086; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320752A
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US638359A
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US667406A
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US754644A
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US780159A
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US788811A
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US1815032A
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US2113916A
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US2214458A
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US2412331A
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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) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |