US2566084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drill
Assignee: Werf Conrad and Stork Hijsch NV
•
Filing: 1948-04-22
•
Granted: 1951-08-28
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Cornelis J Esseling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:53
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B19/00; E21B19/08; E21B19/081; Y; Y10; Y10T; Y10T74/00; Y10T74/17; Y10T74/173
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US492567A
Cited
US1873404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |