US3522755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchor for mine roof bolt
Assignee: LESLIE T MICHELL
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Filing: 1968-07-23
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Granted: 1970-08-04
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Expires: 1988-07-23
Abstract
No abstract record available.
Inventors
- 👤 Leslie T Michell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
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)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |