US3385155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt expansion anchor
Assignee: Individual
•
Filing: 1966-06-17
•
Granted: 1968-05-28
•
Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Leslie T Michell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:21
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA716309A
Cited
US859532A
Cited
US1121980A
Cited
US2870666A
Cited
US2850937A
Cited
FR1231772A
Cited
GB875238A
Cited
US3169440A
Cited
US3115056A
Cited
US3200693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |