Patent US1904249A successfully refreshed from Google Patents.
US1904249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring apparatus
Assignee: CAISSON CONTRACTING Co
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Filing: 1932-05-06
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Granted: 1933-04-18
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Expires: 1952-05-06
Abstract
No abstract record available.
Inventors
- 👤 Charles L Powell
- 👤 Herman R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:22
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/021
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) | 1936-04-17 | 1936-10-17 | 1937-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-17 | 1940-10-17 | 1941-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-17 | 1944-10-17 | 1945-04-18 | $7700.00 | Window Closed / Lapsed |