US2870666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt with abutting shoulder preventing over-expansion
Assignee: PATTIN Manufacturing Co Inc
•
Filing: 1955-02-21
•
Granted: 1959-01-27
•
Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:18
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR767444A
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FR1018678A
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US2667099A
Cited
US2753750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |