US2988950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wedge operated anchoring means for mine roof bolt
Assignee: PATTIN Manufacturing Co Inc
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Filing: 1957-07-31
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Granted: 1961-06-20
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:12
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008; F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |