US2783970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for underwater oil well drilling
Assignee: Individual
•
Filing: 1954-10-25
•
Granted: 1957-03-05
•
Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Samuel S Gillespie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:57
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/124; E21B43/00; E21B43/01; E21B43/0122; Y; Y10; Y10T; Y10T137/00; Y10T137/5762; Y10T137/6851; Y10T137/6855; Y10T137/6906
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |