US2930587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drilling machines
Assignee: Individual
•
Filing: 1956-07-05
•
Granted: 1960-03-29
•
Expires: 1976-07-05
Abstract
No abstract record available.
Inventors
- 👤 Robert M F Seawright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/081; Y; Y10; Y10T; Y10T408/00; Y10T408/16; Y10T408/17; Y10T408/173; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |