US2604304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable drilling apparatus
Assignee: Individual
•
Filing: 1949-01-07
•
Granted: 1952-07-22
•
Expires: 1969-01-07
Abstract
No abstract record available.
Inventors
- 👤 Leon F Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:32
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/027; E21B7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US543378A
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US1323082A
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US876542A
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US1266964A
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GB188674A
Cited
DE383623C
Cited
US1661956A
Cited
US1823446A
Cited
US2104323A
Cited
US2168905A
Cited
US2435192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |