US3389561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for providing anchors in earth and/or rock formations
Assignee: English Electric Co Ltd
•
Filing: 1966-05-23
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Granted: 1968-06-25
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Expires: 1986-05-23
Abstract
No abstract record available.
Inventors
- 👤 Taylor Kenneth Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:59
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/002; E21D20/00; E21D20/02; E21D20/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1746848A
Cited
US2162130A
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US2667037A
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US2618192A
Cited
GB820945A
Cited
US2970444A
Cited
US3212582A
Cited
US3234723A
Cited
FR1249759A
Cited
US3172947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |