US2901223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring drill
Assignee: Hughes Tool Co
•
Filing: 1955-11-30
•
Granted: 1959-08-25
•
Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Floyd L Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:54
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23416E
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US2200482A
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US2320136A
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US2358642A
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US2540464A
Cited
US2661931A
Cited
US2692117A
Cited
US2751196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |