Patent US3391544A successfully refreshed from Google Patents.
US3391544A
Expired / Lapsed
US
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Means and method of forming concrete piles
Assignee: Intrusion Prepakt Inc
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Filing: 1966-12-05
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Granted: 1968-07-09
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Expires: 1986-12-05
Abstract
No abstract record available.
Inventors
- 👤 Donald S Daczko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:22
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E02; E02D; E02D5/00; E02D5/22; E02D5/34; E02D5/36; E02D5/62; E21B19/00; E21B19/08; E21B19/084
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) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |