US2325264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic drilling device
Assignee: Shell Development Co
•
Filing: 1940-09-27
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Granted: 1943-07-27
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Expires: 1960-09-27
Abstract
No abstract record available.
Inventors
- 👤 Merten Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14; E21B21/00; E21B21/01
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) | 1946-07-26 | 1947-01-25 | 1947-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-07-26 | 1951-01-25 | 1951-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-07-26 | 1955-01-25 | 1955-07-27 | $7700.00 | Window Closed / Lapsed |