US2524428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth drill bit
Assignee: Individual
•
Filing: 1946-03-27
•
Granted: 1950-10-03
•
Expires: 1966-03-27
Abstract
No abstract record available.
Inventors
- 👤 Chester B Day
- 👤 Gault Errol Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:18
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1306371A
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US923513A
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US1118292A
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US1096134A
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US1297708A
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US1426681A
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US1742641A
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US1775774A
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US1928451A
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US2118524A
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US2061933A
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US2040074A
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US2200482A
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US2357835A
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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) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |