US2579720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill device
Assignee: Individual
•
Filing: 1948-11-12
•
Granted: 1951-12-25
•
Expires: 1968-11-12
Abstract
No abstract record available.
Inventors
- 👤 Thomas P Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:01
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1489849A
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US1616666A
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US1554160A
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US1937742A
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US1926635A
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US2101566A
Cited
US2144832A
Cited
US2210824A
Cited
US2352412A
Cited
US2472749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |