Patent US2614814A successfully refreshed from Google Patents.
US2614814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal drill bit
Assignee: Joy Manufacturing Co
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Filing: 1948-12-23
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Granted: 1952-10-21
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Expires: 1968-12-23
Abstract
No abstract record available.
Inventors
- 👤 Arden T Jones
- 👤 Clayton A Newport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:18
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316435A
Cited
DE600676C
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GB394890A
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US2097040A
Cited
GB500147A
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GB528593A
Cited
US2380112A
Cited
US2372612A
Cited
US2339104A
Cited
GB599451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |