US2777671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Independent Pneumatic Tool Co
•
Filing: 1953-02-10
•
Granted: 1957-01-15
•
Expires: 1973-02-10
Abstract
No abstract record available.
Inventors
- 👤 George H Fuehrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:55
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; E21B7/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1525036A
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US2123897A
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US2113044A
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US2163034A
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US2181988A
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US2500932A
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US2415205A
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US2456056A
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US2616667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |