Patent US2739790A successfully refreshed from Google Patents.
US2739790A
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Rotary oil well drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1948-09-29
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Granted: 1956-03-27
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Expires: 1968-09-29
Abstract
No abstract record available.
Inventors
- 👤 Charles F Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:48
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; Y; Y10; Y10T; Y10T24/00; Y10T24/47; Y10T24/4755
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |