US2547609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus
Assignee: Joy Manufacturing Co
•
Filing: 1945-06-09
•
Granted: 1951-04-03
•
Expires: 1965-06-09
Abstract
No abstract record available.
Inventors
- 👤 Harry H Vanderzee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:30
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/06; E21B19/00; E21B19/08; E21B19/084; E21B7/00; E21B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1362387A
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US1427410A
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US2274431A
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US2410959A
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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) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |