US2743906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic underreamer
Assignee: Individual
•
Filing: 1953-05-08
•
Granted: 1956-05-01
•
Expires: 1973-05-08
Abstract
No abstract record available.
Inventors
- 👤 William E Coyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:12
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190121696A
Cited
US786137A
Cited
US1887895A
Cited
US1857616A
Cited
US1997436A
Cited
US2548931A
Cited
US2654574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |