US3396541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method for construction sand drains in the earth's surface
Assignee: Intrusion Prepakt Inc
•
Filing: 1965-04-19
•
Granted: 1968-08-13
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Expires: 1985-04-19
Abstract
No abstract record available.
Inventors
- 👤 Lamberton Bruce Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:06
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3217501A
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US3217500A
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FR1311040A
Cited
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US3274782A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |