US3386520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for anchoring the pilot member in a pilot bore
Assignee: Alkirk Inc
•
Filing: 1966-04-01
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Granted: 1968-06-04
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Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Lawrence James Clifton
- 👤 Hamilton William Hauth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:41
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/11; E21D9/112; E21D9/113
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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |