Patent US2217258A successfully refreshed from Google Patents.
US2217258A
Expired / Lapsed
US
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Apparatus for forming tapered concrete piles
Assignee: Individual
•
Filing: 1939-06-06
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Granted: 1940-10-08
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Expires: 1959-06-06
Abstract
No abstract record available.
Inventors
- 👤 Stuart G Ruddell
- 👤 Fraser Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:05
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E02; E02D; E02D5/00; E02D5/22; E02D5/34; E02D5/36; E21B10/00; E21B10/26; E21B10/32; E21B10/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-10-08 | 1944-04-08 | 1944-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-08 | 1948-04-08 | 1948-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-08 | 1952-04-08 | 1952-10-08 | $7700.00 | Window Closed / Lapsed |