US2575239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible bit and holder therefor
Assignee: Marathon Coal Bit Co Inc
•
Filing: 1950-06-13
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Granted: 1951-11-13
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Expires: 1970-06-13
Abstract
No abstract record available.
Inventors
- 👤 Robert J Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:52
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/0002; B23B51/0003; B23B51/00035; B23B51/06; E; E21; E21B; E21B10/00; E21B10/003; E21B10/62; B23B2251/00; B23B2251/50; B23B2265/00; B23B2265/32; B23B2265/326; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/907; Y10T408/909; Y10T408/9098; Y10T408/90993
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US124089A
Cited
US750182A
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US658060A
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US866594A
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US994668A
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US1652129A
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US1879222A
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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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |