Patent US2388741A successfully refreshed from Google Patents.
US2388741A
Expired / Lapsed
US
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Hydraulic drilling device
Assignee: Individual
•
Filing: 1944-04-29
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Granted: 1945-11-13
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Expires: 1964-04-29
Abstract
No abstract record available.
Inventors
- 👤 Russell R Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:06
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/20; E21B21/00; E21B21/10; E21B4/00; E21B4/06; E21B4/14; E21B7/00; E21B7/04; E21B7/06; E21B7/24
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) | 1948-11-12 | 1949-05-14 | 1949-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-12 | 1953-05-14 | 1953-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-12 | 1957-05-14 | 1957-11-13 | $7700.00 | Window Closed / Lapsed |