Patent US3077809A successfully refreshed from Google Patents.
US3077809A
Expired / Lapsed
US
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Roof bolt with a flexible tension member and cup-shaped expansible securing means
Assignee: Bridon Ropes Ltd
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Filing: 1959-05-28
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Granted: 1963-02-19
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Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Harding Denys Frederick
- 👤 Campbell Robert Edward
- 👤 Baker John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:17
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/006; E21D21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US36014A
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US179237A
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US861573A
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US1031462A
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US1278025A
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US1434394A
Cited
US1643110A
Cited
US2129439A
Cited
DE1005474B
Cited
US2970444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |