US3228200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming concrete piles
Assignee: Individual
•
Filing: 1964-09-21
•
Granted: 1966-01-11
•
Expires: 1984-09-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Dufresne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/44; E02; E02D; E02D5/00; E02D5/22; E02D5/34; E02D5/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA582692A
Cited
US1363049A
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US2729067A
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US2920455A
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GB882085A
Cited
FR1177737A
Cited
FR1177819A
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US3096622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |